Unable to log into my account

i see playback from already signed-in devices (attempting) but nothing substantical
I see the browser coming in too (loading) but no authentication.

This is for Synology but because browser & plex.tv are the main components here, physical host platform is immaterial.

Do you see this or the pure “Something has gone wrong” while attempting to load?
(Control F5 is the usual cure for that – list length being loaded).

This is the hard reset of credentials How To