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When we release a new version of Form Publisher, new permissions might be added. If you do not reauthorize Form Publisher, then the add-on will stop working (including files generation, sending emails etc.).
Form Publisher will send you an email to inform you about this new authorization:
What you have to do next is to open your Google Form, go to Form Publisher through the add-on menu, then click on 'Form Publisher Status' to allow the new permissions: