I have had a problem for a while that I can’t resolve.
My Plex account has always been linked with my facebook account, but in the meantime I changed my email address on Facebook and now cannot change the connection via this method because the old address is still activated there …
Can you link your Google account to the Plex account without changing the e-mail address first?
see “Adding Google, Facebook, or Apple to an Existing Plex Account” → “Different Email Address from Your Plex Account” in the support article linked above.
@dngraphisme looks like there was an account created with the gmail in 2019. I changed the email on it to something generic and made sure it was disabled so you should be able to make the change now