Why am I receiving 'The username "myusername" and/or password and/or payload token could not be authenticated by any membership domain.' when attempting to connect to MetaMatrix?

Updated -

Release Found: MetaMatrix Enterprise 5.5 and later

Problem

A user attempting to connect to MetaMatrix is receiving an error message:

ERROR: The username "myusername" and/or password and/or payload token could not be authenticated by any membership domain.

This error occurs when connecting to a MetaMatrix System u...

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