There was an unexpected error in your org which is preventing this assessment check from completing: System.QueryException: List has no rows for assignment to SObject
Setting and Testing External Org-Wide Defaults
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It eventually worked for me. I had disabled 2 partner contacts then re-enabled them, and renaming First and last names of the corresponding disabled users fixed it.
https://trailhead.salesforce.com/trailblazer-community/feed/0D54V00007T4590SAB
Sean Forbes doesn't have access to the Edge Installation opportunity. Redo the steps to give him access.
The name field was encrypted on Contact object, which is now corrected by the Support. Thanks for the speedy response and resolution.