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Microsoft Teams | Development
Building, integrating, or customizing apps and workflows within Microsoft Teams using developer tools and APIs
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In the New Microsoft Teams client, callto: URI handling is no longer reliably supported as it was in the Classic client. The new architecture prioritizes HTTPS-based Teams deep links for initiating calls and navigation. As a result, links such as callto:user(at)domain.com may not trigger calls anymore, even though they worked previously.
The recommended and supported approach is to use Teams deep links, such as:
https://teams.microsoft.com/l/call/0/0?users=user(at)domain.com
You can read more at Deep links overview - Teams | Microsoft Learn
I hope this information is helpful.
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