Turn idle Microsoft Teams Rooms into digital signage. When a room is between meetings, OptiSigns plays your assigned content — announcements, dashboards, branding, menus — right on the room display, and clears it the instant a meeting starts.

This guide covers the two ways to connect a Teams Room to OptiSigns, so you can pick the one that fits how your organization works.

Two ways to connect

	Signage URL · Recommended, fastest start	Service Principal
What it gives you	Get content on a room in minutes — no app registration.	OptiSigns discovers and lists all your Teams Rooms (model, online/offline, health) in one place.
Microsoft setup	None in Azure. You paste a URL in the Teams Rooms portal.	An Entra admin registers a read-only app and grants two permissions.
Best for	Getting started, a few rooms, or when you can't register an Azure app.	Managing a fleet of rooms and seeing their status alongside your other screens.
Who can set it up	A Teams Rooms admin.	A Microsoft Entra (Azure AD) admin, one time.

Important — read this first. Microsoft does not offer a way for apps to push content to Teams Rooms automatically. So with either method, the final step is a one-time manual paste of an OptiSigns signage URL into the Teams Rooms portal. The Service Principal method doesn't push content for you — it gives OptiSigns visibility into your rooms. Many teams use both: Service Principal to see every room, and Signage URLs to deliver the content.

What you'll need

An OptiSigns account on a plan that includes device management (MDM / room integrations), with the Owner or Super Admin role. Start a free trial — you only pay for rooms you activate signage on.
Microsoft Teams Rooms Pro. Digital signage is a Teams Rooms Pro capability — rooms on Teams Rooms Basic can't display signage.
At least one Teams Room that's online and signed in.
For the Service Principal method only: a Microsoft Entra (Azure AD) Global Administrator who can register an app and grant admin consent.

How it works

OptiSigns generates a secure signage URL for each screen you want to show on a room. Microsoft's Teams Rooms Pro platform has a built-in Digital signage feature that can display a custom URL while the room is idle. You paste the OptiSigns URL there once; from then on the room plays whatever you assign in OptiSigns, and updates are live.

When a meeting starts — or someone wakes the room — the display returns to the normal Teams Rooms UI automatically, and signage resumes when the room goes idle again. There's no impact on meeting quality, audio/video, or scheduled meetings.

Open the Teams Rooms page

In OptiSigns, open Devices in the top navigation, then in the left sidebar under Room Integrations, click Teams Rooms. If you haven't connected yet, you'll see the two methods side by side.

OptiSigns Teams Rooms — the two ways to connect: Signage URL (recommended) and Service Principal

Pick your method below.

Method 1 — Connect with a Signage URL (recommended)

No Azure setup. You'll mint a URL in OptiSigns, give it content, and paste it into the Teams Rooms portal.

Step 1 — Mint a Signage URL

On the Signage URL card, click Mint URLs (shown above).

In the New Signage URL dialog, give the URL a Name (for example, your room or location — Atlanta Lobby). The optional Target label is just a note to help you remember where you'll paste it; it doesn't control anything. Click Next.

The New Signage URL dialog — name the URL, then click Next

Step 2 — Assign content

Clicking Next creates the URL and opens the Signage URLs tab (the page now shows Connected · Signage URLs only). On the new row, click + Assign content.

In the Assign content dialog, choose a Content Type — Asset, Playlist, or Schedule — then pick the specific item to play. Click Save.

The Assign content dialog — pick a Content Type, choose the item, then Save

OptiSigns copies the new signage URL to your clipboard and shows the paste instructions. (You can reopen them any time with Show me how to paste on the Signage URLs tab.)

Step 3 — Paste the URL into the Teams Rooms portal

In the Paste your Signage URL in Teams Rooms portal dialog, click Open Teams Admin Portal. Then, in Microsoft's portal:

Sign in and open Digital signage.
Click Add source and give it a clear name (matching your room or group).
Choose Custom URL, paste the OptiSigns URL, then Review → Finish.
Select the new source → Assign to devices → pick your Teams Room(s) → Apply.

The paste-instructions dialog — copy the URL, then click Open Teams Admin Portal

Within about 30 seconds the room fetches the URL and your content appears during idle. Start a test meeting — content should clear instantly when the meeting connects.

Repeat Steps 1–3 to mint a URL for each room or room group. You manage all minted URLs (and reassign their content any time) under the Signage URLs tab.

Method 2 — Connect with a Service Principal

This connects a read-only Microsoft Entra app so OptiSigns can discover and list all your Teams Rooms automatically. (You'll still deliver content with a signage URL — see "Put content on a room" below.)

Step 1 — Register an app in Microsoft Entra

Sign in to the Microsoft Entra admin center as a Global Administrator.
Go to Identity → Applications → App registrations → + New registration.
Name it (for example, OptiSigns Teams Rooms), choose single tenant, and leave Redirect URI blank. Click Register.
On the app's Overview page, copy the Application (client) ID and Directory (tenant) ID — you'll paste these into OptiSigns.

Step 2 — Grant the Microsoft Graph permissions

In the app, open API permissions → + Add a permission → Microsoft Graph → Application permissions.
Add the two read-only scopes OptiSigns requires: TeamworkDevice.Read.All (reads your Teams Rooms inventory) and TeamworkAppSettings.Read.All (reads device health — online/offline, peripheral issues). Tip: click Copy all scopes on the OptiSigns setup screen and paste them straight into the Entra picker.
Click Grant admin consent for <your tenant>. Both should show Granted.

OptiSigns Service Principal setup steps and the two required read-only Graph scopes — use Copy all scopes

Step 3 — Create a client secret

In the app, open Certificates & secrets → Client secrets → + New client secret.
Give it a description and an expiry, then Add.
Copy the secret Value immediately — Microsoft only shows it once. If you navigate away you'll have to create a new one.

Step 4 — Connect in OptiSigns

Back on the OptiSigns Teams Rooms page, on the Service Principal card, click Add Service Principal. Paste:

Name — any label (for example, Contoso Teams SP)
Application (client) ID — from Step 1
Directory (tenant) ID — from Step 1
Client Secret — from Step 3

Click Test Connection. OptiSigns validates the credentials against Microsoft Graph and shows your tenant name on success — then Save lights up. Click Save.

The Add Service Principal dialog — fill the four fields, then Test Connection before Save

Within a few minutes your Teams Rooms appear in the Devices tab, each with its model and live online/offline status.

[Screenshot to add: the connected Devices tab showing "Connected · <tenant> · N rooms synced" and the synced room list — captured once a Microsoft tenant with Teams Rooms is connected.]

Put content on a room

Discovering rooms doesn't put content on them — that still uses a signage URL. From the Signage URLs tab, click New Signage URL and follow Method 1, Steps 1–3 above to mint a URL, assign content, and paste it into the Teams Rooms portal for that room.

Licensing

Activating signage on a Teams Room uses one screen license from your OptiSigns pool — the same licenses you use for any other screen. Discovered rooms that you haven't activated are free; you're only billed for rooms you turn signage on for. See full pricing →

Troubleshooting

"Test Connection" fails with "Invalid client credentials." Re-check the Application (client) ID, Directory (tenant) ID, and Client Secret — copy them exactly from the Entra app. If the secret has expired, create a new one in Certificates & secrets and paste the new value.

"Test Connection" fails with a permissions error. You haven't granted admin consent. In Entra, open the app's API permissions, confirm the two Microsoft Graph scopes show Granted for <tenant>, then click Grant admin consent. Consent changes take about a minute.

My rooms don't appear after saving the Service Principal. The first inventory sync can take a few minutes. Click Sync now on the Teams Rooms page to refresh. Confirm the app has TeamworkDevice.Read.All with admin consent.

I pasted the URL but nothing shows on the room. Confirm the room is online and licensed for Teams Rooms Pro (Basic doesn't include digital signage). Make sure you pasted the full URL (it begins with https://) as a Custom URL source, and that the source is assigned to that device in the Teams Rooms portal.

Content shows but doesn't clear when a meeting starts. This is controlled by the Teams Rooms digital-signage setting in Microsoft's portal — confirm signage is set to display only while the room is idle.

The Teams Rooms portal says the URL is invalid. The URL may have been truncated on copy. Return to the OptiSigns Signage URLs tab, click Copy on that URL again, and re-paste.

Need help?

Email: support@optisigns.com
More guides: support.optisigns.com
Related: Connect Zoom Rooms to OptiSigns · Connect Cisco Webex Rooms to OptiSigns