Knowledgebase: Troubleshooting
Exchange account cannot login on mobile app
Posted by Olivia Rust on 24 May 2024 11:45

Some users experience issues with their Exchange accounts on our mobile app, even though the same account connects correctly on desktop.

This is caused by incorrect NTLM implementation in the .NET platform, which our and many other applications use. This issue is usually triggered on Exchange accounts if you have "Extended protection" enabled on your server and it affects only mobile apps, not the desktop program.

Our developers have created a fix for .NET in its current version .NET 8 and .NET 9, and it should hopefully be merged soon.

Unfortunately, until that happens, we cannot provide any alternative solution - only wait for the fix to be merged into the .NET platform.

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