When using Fabric Waystones by LordDeathHunter, there is no way to allow players to use waystones in claims without owning the claim. I can't allow my players to use them inside of a server claim.

Have you tried adding a global block exception in the main config file?

I'm having the exact same issue. I'm fairly certain there is a setting to fix it, I'm just unsure how

How would I do that?

Look for it in the main config file.