Heya to anyone listening - Been using DnD beyond for over four years and never yet has this issue. Unsure if its a stupid new feature or a bug. Basically when I'm trying to add a subclass feature such as Divine Magic Affinity (from Divine Soul Sorcerer) to the 2014 sorcerer class, there are no options displayed, with the only one being 'Choose An Option'. The same happens if I try and select the Rune Knight runes for Rune Knight Fighter, or any other expanded rules subclass' features to a 2014 class. 

I've done some testing and it seems to be because the 2024 rules only allow the subclass and its features at level 3 rather than level 1 (or whatever other level the feature comes at), which then do allow me to select the options, but I don't yet use the new rules for several reasons. If this is the case, I don't know why its suddenly happening now, and not when the 2024 rules originally released. 

I have all sources enabled, many of the extra content books, and back when piecemeal existed I brought practically all of Tasha's and Xanthar's Guides, so I've had all the required stuff for years. The problem persist for both my own characters and for when I'm changing a player's features, so none of us can select the options. 

As ever, any help at all is appreciated! 

They changed something in the last few days that caused people who had purchased individual subclasses (back when that was a thing) to suddenly stop seeing the options for certain choices related to those subclasses if they never owned the full book. There have been several threads about it recently; apparently the devs are looking into it. See here for instance.

Thank you!