We have performed a bulk import of Dynamics 365 contacts from AAD. But, when an imported user attempts to log-in to the D365 portal they are always returned to the log-in screen. Why is this?
The authentication is working for non-imported contacts (new user), so it is something related to the import that is causing the problem.
An example imported record is shown below. I have noticed that no External Identities are set, whereas working contacts have a value set here – could this be the cause of the problem, and if so how would I fix this?
Any help will be much appreciated.
Our portal site settings for authentication are:

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