Error code - 2:-1001

[Takahiro Masuda]

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Error code - 2:-1001

There's a more permanent way to sign in to Microsoft Teams. If you're having trouble completing the process, talk to your IT admin.

1. What is error code 2:-1001?

2. What is the more permanent way to sign in to Microsoft Teams? I am the IT admin.

[#2]

Don’t think I’ve ever seen this before...do you have a screenshot? Can’t you log in at all? Is it the desktop client?

[#3]

@adam deltinger yes this is the desktop client. Multiple people in my company using Macs are having problems. Windows client works fine.

[#4]

bump

Still nobody able to login using Mac OSX desktop client. Might be Modern Auth problem. Forms authentication is enabled on ADFS.

[#5 · Accepted solution]

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:

~/Library/Application Support/Microsoft

Try deleting the Teams folder there.  This appears to be where all the settings, cookies, caches are stored for that current user.

[#6]

@Takahiro Masuda 

This worked for me. Thank you

[#7]

@Takahiro Masuda 
Thank you for sharing the fix, although it only fixes the problem for me only once.

Anytime I restart the app, it returns back again so I have to delete the same folder every time I need to use Teams, is there any permanent solution ?

Thanks,