1.19.21 realms resource packs

My partner has a realm he runs off Xbox one. We use a texture pack to spice up the world. We discovered a new one that we wish to add to the existing one but when we try to use it the realm becomes unavailable, textures break or only some players can view the changed textures. We tested the resource packs in solo and multiplayer worlds and it works perfectly fine.

The screenshot attached is the screen I get when they add the texture. (I run windows 11)