Following a recent upgrade from ArcGIS Enterprise 10.8.1 to 11.1 we are now getting an error when we select the sign in screen while accessing Portal via Azure AD. When users connect to the Portal through the myapps.microsoft.com link they can connect to the Portal Home page and view the Gallery but when the 'Sign In' button is selected it returns:
| ArcGIS Portal Directory | | | | |
Invalid redirect_uri
Error: 400
We only have the ArcGIS Login enabled, there is no SAML Login or Open ID Connect Login enabled.
The internal URL to Portal still allows us to access the Sign In screen and sign in using the ArcGIS Login as before. Does anyone have ideas how we can address this?