Wildemount content not available on the new classes - still available on 2014 classes

This got reported by one of my players so I had a look into it and it seems like the 2024 classes (Wizard and Fighter) do not offer the Wildemount subclasses

If I pick the 2014 version of the class on the exact same character it offers those subclasses - Echo Knight fighter, Chronurgy and Graviturgy wizard

As its the same character sheet and I'm not changing any other settings its not the settings - I have all the categories switched on and am not changing those

The Critical Role subheading and contents simply do not appear on the selection dropdown when I am selecting for a 2024 class but do when I am selecting for the 2014 version of that class.

There is nothing remotely incompatible with these subclasses. 

Echo Knight just works as-is rules wise

The wizard subclasses just need shifting their level 2 features to level 3

That all seems like stuff that could simply be done in Beyond because no rules revisions are needed. Oh well.

But this one was directly published by WotC

So that seems odd. Of course I don't know who wrote what into the contracts but this is not ostensibly the same as the stuff published as 3rd party then placed on Beyond - this was always a WotC and D&D publication.

It also does not show up as an option in the homebrew system so you would be re-inputting it all by hand. Which is honestly a bit of a grind for my player.

You can only use something as a template in the homebrew system if you own it, not if it's shared with you. So whoever in your campaign owns it is the one who should try making a copy for the 2024 edition (caveat: there might be other issues with that, I haven't tried to convert anything to 2024 rules).