Plex server wants me to login but says There was an Error Logging in

Server Version#:1.19.4.2935-79e214ead
Player Version#:
When I start Plex server on my desktop it asks me to login. I login with my email. The login page says You Have Successfully Logged in. It then sends me to a PLEX WEB page which says that There Was An Error Signing In. How do I get out of this circle.
I get a similar problem if I run Server on my NAS , It also says
“This application is at 192.168.2.50 and is not hosted by Plex. Continue only if you recognize this server and wish to grant access” . When I click on Login I get sent back to the same thing.
If I run Plex server on my laptop there is no problem.

I have found that If I use Chrome that it works. It would seem that Firefox no longer works.

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