If a user is having Trouble signing in via SSO please run through the following bullets.
B2C Object ID does not exist in User Table on the insellerate database but user exist in AAD
Delete in AAD, have user try again
The isActive column of the User Table on the insellerate database is set to 1
Login redirects to login is a side effect of this
SSO user account is provisioned in the client’s SSO tenant
Check that the email address in the User Table and User Profile table match
If they do not match, find out what the correct email is, and update accordingly.
Ask the client’s IT team to check that the email address/user account is provisioned in the client’s SSO tenant.