Sign in with the account tied to your access to continue.
Either one signs you in instantly and confirms it's really you — so all your app buttons, requests, and the AI assistant work. Use the account that matches your Plex. Google is smoothest on phones; Plex works with any email, including Apple.
Heads up — a typed email is limited: it can't unlock your app buttons or the AI assistant, because it doesn't prove who you are. Google or Plex is the way to get full access.
Whichever you pick, use the account that matches your Plex — that's what links everything together.