Samsung 2011 TV Plex App Stopped Working

The contact email on the TV redirects me to here, so I paste my mail:

I wrote to you because since the last week, the plex application has suddenly stopped working on my TV and there’s nothing I can do…

I have noticed the problem for the first time on the 27th of April. When I try to open de app on the TV, it stays connecting indefinitely in the smartTV menu.
This continues happening a week later, so I try to delete the app and reinstall it (the same version, I already had the last), and now I can open the app but I can’t login with my account.
I have tried with the full email and the short user, and it says to me that it’s not possible get the information of this account. While in other devices I can login with the same inputs.
So I thought that it could be server stuff, maybe a bad update, so I tried to downgrade to the previous version (I also have the last version), but nothing has changed.

I don’t know what else to try, so I tell you the problem and all the parameters of interest:
TV model: Samsung UE40D6530WSXXC (2011)
TV app version: 1.01900 (2016-11-10)
Server version: 1.15.4.993 (2019-04-26)

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