Moonbeam doesn't work with armor and weapon perks

[Leshotgunner]

Radiating shockwave, reverberation, you name it.

[Tafomal]

this is true. i also write to larian for the bug support, but they doesn't fix it.. also you can use moonbeam in sanctuary, and this is not correct as RAI rules of dnd, but RAW then i think it could be ok, but it is not correct that doesn't work with radiant orb build

Check it

https://www.sageadvice.eu/does-sanctuary-end-when-spirit-guardians-deals-damage-to-enemies/

[500KG]

This makes me sad :(

[DeMasked]

Moonbeam is apparently considered an attack that is separate from your character which is why Sanctuary works of some odd reason and why Radiant based items don't work.

Probably a bug.