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Same for me.

Plex pass member, updated this evening and now it will not let me login. I can login on the webpage here just fine, but not through the PMS app on my Synology server.

This is 2 updates in a row with issues and it is normally quite flawless (from my perspective)

Broken as well.
Browser, server/web, and Public/PlexPass releases agnostic.
Something broke on Plex’s Auth side.

Same problem here mid-west USA 5:45 pm. Nothing to do with an update. Just continually loops login.

So much for needing to authenticate with their damn server! Isn’t this like the 3rd time in a month they had troubles!

This is unacceptable. If you are going to charge for services, those services need to be available.

I see at least they posted they are working on the issue in Twitter.

System status updates are available here: https://status.plex.tv/

Identified
One of our database slaves is misbehaving (behind on database replication and returning very slow queries). We’re removing the slave from the pool and promoting a backup.
Posted 6 minutes ago. Oct 22, 2017 - 16:08 PDT
Investigating
We’re investigating issues with our authentication service - particularly when using the 4-character app linking codes.
Posted 39 minutes ago. Oct 22, 2017 - 15:35 PDT

worked for a few minutes for me too on 2 devices then kicked them back out

Folks…your status says everything is fixed and it is not…it says authentication confirmed then just loops me back to login with google…not able to see my server…running Plex Lifetime…I can access info through using a regular web browser login, but not able to launch PMS from my server and access.