Error connecting to Azure AD sync project after upgrading to 9.1

I get the following error trying to connect the Azure Active Directory sync project.

[System.Exception] [ServiceException]: Code: generalException - Message: An error occurred sending the request.
[MsalClientException]: There was an error parsing WS-Trust response from the endpoint. This may occur if there is an issue with your ADFS configuration. See aka.ms/msal-net-iwa-troubleshooting for more details. Error Message: Federated service at autologon.microsoftazuread-sso.com/.../usernamemixed returned error: Authentication Failure
[MsalServiceException]: Federated service at autologon.microsoftazuread-sso.com/.../usernamemixed returned error: Authentication Failure
[MsalServiceException]: Federated service at autologon.microsoftazuread-sso.com/.../usernamemixed returned error: Authentication Failure

[Microsoft.Graph.ServiceException] Code: generalException
Message: An error occurred sending the request.

[Microsoft.Identity.Client.MsalClientException] There was an error parsing WS-Trust response from the endpoint. This may occur if there is an issue with your ADFS configuration. See aka.ms/msal-net-iwa-troubleshooting for more details. Error Message: Federated service at autologon.microsoftazuread-sso.com/.../usernamemixed returned error: Authentication Failure
[Microsoft.Identity.Client.MsalServiceException] Federated service at autologon.microsoftazuread-sso.com/.../usernamemixed returned error: Authentication Failure

There was no issue with the connection before we upgraded from 8.1.5. The Sync project upgrade is failing because it can not connect.

Has anything changed in 9.1 that we need to add?