Event ID 8306: An exception occurred when trying to issue security token: The server was unable to process the request due to an internal error.

Event ID 7557: The Secure Store Service application Secure Store Service Application is not accessible. The server was unable to process the request due to an internal error

Solution was that the ‘Claims to Windows Token Service’ wasn’t started on the Sharepoint server. Start the service .

Clamis-Windows Service

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