Can't login to Plex server on old Mac Mini

Hi, I haven’t used my Mac Mini for some time, but have recently come back to it, however I can login to my Plex account, I cannot login to the Plex server.
I can login to the Plex server on other devices, but not the Mac Mini.
I am assuming that the Mac Mini’s OS X is too old and I am unable to update it, so I was wondering if anyone had a solution?

Thanks in advance

Trev

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