Our company uses Azure AD, and has integrated SSO with Slack enabled.
I am using Edge Beta version (tried with Dev as well) and login to Slack fails on my AAD joined machine with my AAD work account sync enabled profile.
Request Id: 0fdc5271-c48a-40d0-93aa-770bcfd09600
Correlation Id: 17a3aa02-838b-446f-a54c-f146921455ae
Message: AADSTS75011: Authentication method 'X509, MultiFactor' by which the user authenticated with the service doesn't match requested authentication method 'Password, ProtectedTransport'.
This error doesn't happen on -
If the machine is not joined to AAD
If the edge user profile is not set to work account sync
Other SSO enabled site like Atlassian, Workday, etc.
My guess is that integrated SSO is not negotiating the allowed authentication methods correctly.