I recently decided to add my homebrew Paladin subclass to dndbeyond but I am unable to publish it because it says "This homebrew Subclass has data mapped to it that is licensed content or private homebrew. This typically occurs when licensed or private homebrew spells are linked to the Subclass." but I have no idea what about it is data mapped. Several times while I was making the subclass it said it was like the Circle of Spores druid but when I looked at Circle of Spores absolutely none of the abilities seemed anywhere close the the abilities of the subclass I was making. Any DMs that have posted homebrew know why this is or any common fixes I can do to make it publishable?

As far as the Circle of Spores part, I think that just happens before the features are reviewed by what I imagine to be a content-reviewing bot dndbeyond runs.

For the data mapping issue, that only occurs when there are spells (oath spells in this case) that the subclass allows access to but are not free to use on dndbeyond (i.e. Cure Wounds is in the Basic Rules and therefore free to use, while Holy Weapon is in Xanathar's Guide to Everything and therefore not free to use).

That makes sense. But I just checked and the Oath spells that I gave this new Subclass are all within the regular PHB. Could it be that my wording of the abilities be too close to the way WotC writes their abilities?

Dndbeyond only allows you to publish basic rules spells, and spells from the elemental companion guide, in other words only free stuff.

If they come from the PHB and not the basic rules, they are not included.