I have the same problem when trying to edit my app, I am trying to open the app in PowerApps Studio (web) for 2 hours now. In this case it doesn't give any further information about the issue, it just displays the loading wheel indefinitely. It worked for me 13 hours ago.
I tried deleting browser data and using different browsers in general but that does not help. I suppose there is nothing I could do on my end to fix this issue.
I found it in Office 365 Admin Center under the Service Status Pages.
(Having a Swedish version I am not 100% sure if this is exactly what these areas are called.)
Incident ID: MO195050
Same issue here in Belgium..
When opening an app for editing on PowerApps Web, it gets stuck on on the "Getting your app ready" screen.
I tried with different apps and on different browsers but the issue does not resolve.
Latest update on the underlying issue from Microsoft:
Title: Unable to access some Microsoft 365 services or features User
Impact: Users may be unable to access some Microsoft 365 services or features. More info: Power BI, Intune, SharePoint Online, and Microsoft Flow are confirmed to be affected. Current status: We've deployed a fix, and we're seeing gradual service recovery while it propagates throughout the affected environment. We're monitoring the environment as the fix progresses. Scope of impact: Any users accessing specific Microsoft 365 services in Western Europe may experience the effects of this service issue.
Start time: Thursday, November 7, 2019, at 2:40 AM UTC
Next update by: Thursday, November 7, 2019, at 11:00 AM UTC
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