Microsoft Edge doesn't see URL:TEL default app protocol

Esher College IT Services 106 Reputation points

Domain environment, latest version of Chromium Edge, Windows 10 20H2, latest version of Teams machine wide installer.
We set default apps using the layout modification xml and group policy and everything works perfectly, Teams opens by default when phone numbers are clicked in Outlook etc, but when a user clicks a telephone number on a website Edge opens the Pick an App selection and Teams isn't available on the list.
I know Edge can see that Teams is installed as when a user clicks a link to join a Teams meeting it knows to open Teams, but why isn't it honouring the default app for phone numbers?
If anyone has any ideas please let me know.

Microsoft Edge
Microsoft Edge
A Microsoft cross-platform web browser that provides privacy, learning, and accessibility tools.
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Microsoft Teams
Microsoft Teams
A Microsoft customizable chat-based workspace.
5,299 questions
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  1. Zhengqi Lou-MSFT 8,806 Reputation points Microsoft Employee

    Hi @Esher College IT Services ,

    I tried several browsers and got the same issue. I believe that's because this protocol is not defaultly associated with Teams client.

    You could modify the registry manually:

    1. Navigate to: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\Capabilities\URLAssociations
    2. Add new string key: name : tel, Data : TeamsURL.
    3. Then you could go to Settings > Default app > Set default by app > Choose Teams and apply the URL:TEL.

    Best regards,

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