The team looked at the session provided, one thing that should get you past the issue is to clear your browser cache in Edge. This looks like it clears up the issue.
It also looks like your user might not have access to the SharePoint site. When you share your app, that will give access to the app to that user, but the data also needs to be shared. Make sure they have access to your SharePoint list. Let me know if that helps.
i have assign full permission to the user, he can access SharePoint site but when the user open the list form which i designed with PowerApps its give him a pop-up to choose a connection.
kindly check the attachements ...
Bilaldev, can you try to get a session id for your issue, the team is looking into it: https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/get-sessionid
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