The Salesforce Administrator at Ursa Major Solar is trying to create a partner user for...

Two reasons causing this issue are C and D. To create a partner user for their Partner Community, the Salesforce administrator needs to have two requirements met: The account record associated with the contact record must be enabled as a partner, which means that it has the Is Partner checkbox checked. This indicates that the account is part of your partner network and can access your Partner Community site. The Salesforce administrator must be marked as a delegated administrator on the partner account, which means that they have limited administrative privileges to perform certainuser management tasks on behalf of an administrator. This allows them to create partner users from contact records without having full system administrator access.