Dear PM,
Do you connect the form to a SharePoint site list? If yes, what's the permission do you have on the list?
If it is convenient, you can refer to the suggestion Glnnhoffman mentioned in Network error when using patch function. You don't... - Power Platform Community (microsoft.com) to see the result.
Welcome to share any updates when you have time if you need further help on this issue.
Thank you for your effort and time!
Sincerely
Cliff | Microsoft Community Moderator