I'm a bit confused. Which Earths are canon? I list what I think and you can add what I am missing:
Pre-Crisis:
- Earth-1: Arrowverse (Arrow, The Flash, Legends of Tomorrow, Vixen…)
- Earth-9: Titans
- Earth-38: Supergirl
- Earth-66: Batman (1966 Series)
- Earth-76: Wonder Woman (1976 Series)
- Earth-85: 1985 Crisis on Infinite Earths (?)
- Earth-89: Batman (1989)
- Earth-90: The Flash (1990 Series)
- Earth-96: Superman Returns
- Earth-167: Smallville
- Earth-203: Birds of Prey (2003 Series)
- Earth-666: Lucifer
- Earth-D: DC Comics Earth-D (?)
- Earth-F: Superman (1941 Animated Series)
- Earth-N52: DC Comics New 52 (?)
- Earth-P: Powerless (?)
- Earth-X: Freedom Fighters: The Ray
- Earth-???: Black Lightning
- Earth-???: DCEU
Post-Crisis:
- Earth-Prime: Arrowverse
- Earth-1: DCEU
- Earth-2: Stargirl, The Batman (?)
- Earth-9: Titans
- Earth-12: Green Lantern
- Earth-19: Swamp Thing
- Earth-21: Doom Patrol
- Earth-96: Superman Returns
- Earth-???: Superman & Lois
- Earth-???: Joker (?)
Pre-Crisis
Earth-1: Arrowverse
Earth-9: Titans
Earth-38: Supergirl
Earth-66: Batman/The Green Hornet
Earth-76: Wonder Woman (1976 Series)
Earth-89: Batman (1989)
Earth-90: The Flash (1990 Series)
Earth-96: Superman Returns
Earth-167: Smallville
Earth-203: Birds of Prey
Earth-666: Lucifer
Earth-F: Superman (1941 Animated Series)
Earth-P: Powerless
Earth-??: Black Lightning
Earth-??: DC Extended Universe
Post-Crisis
Earth-1: DC Extended Universe
Earth-2: Stargirl, The Batman
Earth-9: Titans
Earth-12: Green Lantern
Earth-19: Swamp Thing
Earth-21: Doom Patrol
Earth-66: Batman/The Green Hornet
Earth-76: Wonder Woman (1976 Series)
Earth-90: The Flash (1990 Series)
Earth-96: Superman Returns
Earth-97: Batman (1995)
Earth-167: Smallville
Earth-203: Birds of Prey
Earth-666: Lucifer
Earth-F: Superman (1941 Animated Series)
Earth-P: Powerless
Earth-Prime: Arrowverse
Earth-??: Superman (1978)
Earth-??: Joker
Earth-??: Harley Quinn (2019 Animated Series)
Earth-??: Superman & Lois
Earth-??: The Sandman/Dead Boy Detectives
They confirmed all the pre-crisis Earths based on established movies/shows were restored. All comic-based Earths are variants because it's set in a separate multiverse. TTG isn't canon because obviously that was a TV screen. That would occur in an Animated Multiverse with the DCAMU and Teen Titans I take it.