Error: Data could not be saved. This constituent is already linked to an existing Blackbaud Internet Solutions member: <member_name>""

Occurs when committing BBIS Signup Transaction Batches
Currently, BBIS doesn't do any auto-match or duplicate checking when a new user registers (other than making sure the username is unique), so it is by design that the batch processor must decide how to handle the situation when the "constituent is already linked" batch exception is thrown. 

Unlinking the existing user is fine, but BBIS will mark that website user as provisional, and when any action is taken on the old user (trying to login or trying access from users gallery) it will see that they are provisional and create a signup request.  The old user should be un-linked AND deleted, or just delete the signup request that gets generated.

Environment

 2.91.1535.54

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