Error: An unknown error occurred during the request. - when editing relationships

When editing relationships in version 2.91, users may receive the "Error: An unknown error occurred during the request. This could indicate a request to an invalid endpoint or a problem with the web server configuration."

Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001, patch 72 ; 2.91.1535, patch 33

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