I am trying to make a 2024 version of my paladin. I can pick Oath of Devotion because it is free. I can pick the Xanathar's options and Oathebreaker because they are from 2014 content I own, but I cannot pick the 2014 version of things I own if they're in 2024 content I don't own. I can't use the Oath of the Ancients.
Genuinely, my advice is switch to Pathfinder. The shitty behaviour from WotC with the OGL is what finally got me to pull the trigger
I cancelled my subscription, but renewed once they released the 5e SRD under CC. Saying to move to an entirely different game because I have some gripes with the online version is pretty laughable and wildly off topic. I don't doubt PF online stuff is better, but I can't magically convince my entire playgroup to switch.