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Android Teams login fails during ADFS federation with SSL error
Hello Android mobile users cannot sign in to Microsoft Teams The login fails during the ADFS federation step due to an SSL error Environment Android OS versions 10 to 14 Microsoft Teams mobile a...
Android WebView-based Microsoft applications (including Teams, Outlook, and OneDrive) may encounter SSL untrusted errors if the ADFS server does not deliver the complete certificate chain during federation. Microsoft’s guidance is to configure ADFS/IIS to present the full chain, including all intermediate certificates. Additionally, SSL inspection or proxy interception can contribute to these authentication failures, particularly on mobile clients, even when desktop browsers appear to function normally:
Android certificate-based authentication with federation - Microsoft Entra ID | Microsoft Learn
Untrusted Certificate Error on Android