@Benoit Dupont-We have Tested the SSO on IOS AND Android. It is working fine from our end.
Could you please check it once with the below attached manifest.
[App-SSO.zip](https://github.com/OfficeDev/Microsoft-Teams-Samples/blob/main/samples/app-sso/csharp/demo-manifest/App-SSO.zip)
Also check the Prerequisites and Setup with the below sample-
https://github.com/OfficeDev/Microsoft-Teams-Samples/tree/main/samples/app-sso/csharp