Dear Benjamin B. Guidote
Good day! Thank you for posting to Microsoft Community. I am happy to help you
I noticed that you seem to be moving toward creating a workflow. I want to confirm whether you want to use PowerAutomate?
I also understand that you want to control the acceptance of responses, which in my experience can be done directly in Settings, you can refer to my screenshot:
After you uncheck Accept reply, if you access a previously shared link, the form will be shown the form is closed after you submit a reply
When you check again, you can submit a response.
Please feel free to contact me if I misunderstand your meaning. I look forward to your reply. Thanks for your cooperation.
I wish you all the best.
Sincerely,
Tin | Microsoft Community Moderator