Just an FYI for the PowerApps team, when using Edge and signing into Office.com going into PowerApps does not use the current users session that was just signed in, it uses cached credentials for a previous user even if they've signed out of Office.com
I am able to duplicate this issue by:
1. Sign into Office.com as User1
2. Open PowerApps
3. Sign out of Office.com
4. Sign back into Office.com as User2
5. Opening PowerApps then is still signed in as User1 with all of their security permissions etc.
Not sure if this is intended but when I sign out of Office.com I'd expect all products I'm signed into on that machine to be logged out of as they're all under the 1 users credentials.