I'm getting the same error message this morning. First time ever I've seen it. Searching the archives doesn't produce any solution -- it seems that everyone just waited and it eventually came back. The last time was March 15.
UPDATE: shortly after my original post, I could see the list of my apps. However, after trying to open one, I got the error message, "Sorry, we didn't find that app." I don't know if it's a sign of progress that I could see my apps. I'll keep trying.
Power Automate is also failing for me. (Southern Wisconsin, USA.) I could see the list of flows, and I could even open one up for editing, but data connections failed. I also could not create a new flow.
Central Florida, USA here. Power Apps is the only system down for us but a few apps are working, the majority are not. Down detector is showing over 600 cases reported of Office 365 Outages. Microsoft still hasn't announced a mass outage in the Admin Center.
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