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One more workaround: please embed the app using the Embed web part with the app’s web link instead of the PowerApps web part
We’re seeing the same issue here.
Previously added apps embedded in SharePoint using the Power Apps web part are still working without any problems. However, any newly added apps, or even older apps that previously worked and are added again, are failing. This is happening on the same site as well as on new sites and pages.
A few details from testing
We have already checked the following:
This looks like a problem with the SharePoint Power Apps web part itself, rather than with the app or permissions.
We’ll probably wait a few days before raising it, but it is now blocking work on our side.
Older applications already embedded in SharePoint pages still work as expected, and if we duplicate one of those web parts on the same page, it initially works as well.
However, as soon as we try to add a new Power Apps web part or edit and save the duplicated one the error appears, even if we simply copy and paste the exact same app link.
Under review
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