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@adam deltinger yes this is the desktop client. Multiple people in my company using Macs are having problems. Windows client works fine.
Still nobody able to login using Mac OSX desktop client. Might be Modern Auth problem. Forms authentication is enabled on ADFS.
If anybody else runs into this problem this is how I fixed it.
Please follow the below steps:
Go to Go > Go To Folder > Type in:
Try deleting the Teams folder there. This appears to be where all the settings, cookies, caches are stored for that current user.
This worked for me. Thank you