Plex login can accept email as well
MODIFY
plex_trakt_sync/commands/plex_login.py
plex_trakt_sync/commands/plex_login.py
success, title)
PROMPT_PLEX_PASSWORD = prompt("Please enter your Plex password")
-PROMPT_PLEX_USERNAME = prompt("Please enter your Plex username")
+PROMPT_PLEX_USERNAME = prompt("Please enter your Plex username or e-mail")
PROMPT_PLEX_RELOGIN = prompt("You already have Plex Access Token, do you want to log in again?")
PROMPT_MANAGED_USER = prompt("Do you want to use managed user instead of main account?")
SUCCESS_MESSAGE = success("Plex Media Server Authentication Token and base URL have been added to .env file")

Plex login can accept email as well