Hello,
We encountered a similar scenario while implementing and testing Sales Order Agent.
One thing we found is that Sales Order Agent runs under its own Agent User, not the logged-in Business Central user's account. Because of that, having the SUPER permission set assigned to the logged-in user doesn't necessarily mean the agent has the permissions it needs to complete the task.
I'd recommend checking the following:
-Verify that the required permission sets are assigned to the Sales Order Agent User.
-Review the complete task error, as it often identifies the dependent table, page, or extension causing the failure.
-If custom extensions participate in Sales Quote creation, make sure the Agent User also has the required permission sets for those extensions.
-As a quick test, temporarily assign the SUPER permission set to the Agent User. If the process succeeds, you've confirmed that the issue is permission-related.
We documented this implementation scenario, including permission troubleshooting and supporting screenshots, here:
https://acumens.com/Blog/SalesOrderAgent/#Investigating-Sales-Order-Agent-Permissions-Errors
I hope this helps.