Forum Discussion Has any come across this error code for Teams 0xcaa80000? Seem to be a lot of forum post about Outlook on various forums, but nothing for Teams. I have tried from a different Windows account on the same machine and can login fine. Tried deleting the cache etc. Made sure the time is correct and is auto updating. Teams was signing in previously for the user, but has stopped working today. They can log to the Teams web app fine from the same windows account. Our authentication goes via a local ADFS server. Full message is:

We can't connect you It looks like we can't connect to one of our services at the moment. Please try again later, or contact your helpdesk if the issue persists. adfs.domain.com blue_man to ThereseSolimeno Aug 06, 2020 ThereseSolimeno I found that deleting the token binding key had resolved the issues for a number of people in Google searches that I did. Only thing is when I deleted the token key I logged into the Teams app and it error'd again. Then as part of a fiddler trace I was doing I kept trying to connect a few times with Teams one after the other and finally the ADFS page popped up to enter the users username and password and it signed in! Unsure if deleting the binding key fixed the issue or not! C:\Users\BobSled\AppData\Local\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AC\Microsoft\Crypto\TokenBindingKeys\Keys fb47a8d42be514593f982d4b0d7edd08_90cb05ef-cd90-4066-aafe-3397eb8039a5_4068bc0f75fd0f09b9c2c7507f15f982 Marked as Solution ThereseSolimeno I found that deleting the token binding key had resolved the issues for a number of people in Google searches that I did. Only thing is when I deleted the token key I logged into the Teams app and it error'd again. Then as part of a fiddler trace I was doing I kept trying to connect a few times with Teams one after the other and finally the ADFS page popped up to enter the users username and password and it signed in! Unsure if deleting the binding key fixed the issue or not! C:\Users\BobSled\AppData\Local\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AC\Microsoft\Crypto\TokenBindingKeys\Keys fb47a8d42be514593f982d4b0d7edd08_90cb05ef-cd90-4066-aafe-3397eb8039a5_4068bc0f75fd0f09b9c2c7507f15f982