Hi @田中優貴
you would need a custom user picker field that would only contain an ootb or custom group only containing customers.
This setup is not recommended as a best practice., as users should be able to create their own requests.
As the user requesting is the reporter or the issue, you would need to add automations, the the chosen user needs to be set to the field reporter and the original reporter to the field request participants, to make sure both user will be notified and that the users can still see this ticket under their issues on the portal
There is no official documentation on this.
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