Hi! Case number: 03097333
Esri Support directed me here. Looking for help setting up ArcGIS for Teams. IT is testing this functionality before releasing to the rest of our organization, the non-signed in version works fine. However, IT is unable to sign in using the "ArcGIS Online" or the "ArcGIS Enterprise" option. Normally for AGOL we sign in using SAML/SSO in the browser Olmsted County Geographic Information Systems (GIS) (arcgis.com) which works to do that.
What happens in teams is a blank window opens up and nothing else happens.
We are a government organization and there doesn't seem to be any info out there related to extra configuration steps we need to allow Teams/Microsoft 365 to sign into AGOL.