
I have a project on Sharepoint Online, where I have powerapps forms for several lists.
Today, after a week-vacation, I returned to my project, and what I see is:
When trying to open form ( in List I click Customize forms) : Forbidden error
When trying to create new form (for new list, created from scratch) : Error saving - i get immediately after opening Powerapps.
Hi @kiryanovoa,
Please first check your SharePoint list permissions, make sure you have proper permission to make customizations for SharePoint forms.
Further, it would be much helpful if you could share the translations of the message in your second screenshot.
Besides, when things related to Session ID, it is recommended to submit a support Ticket, as forums here doesn't have the proper approach to analyze the backend Session traces.
For submit Support Ticket, please click the button at the bottom of the following page:
https://powerapps.microsoft.com/en-us/support/
Regards,
Michael