How does the Sanctuary spell stack with the College of Glamour bard’s Unbreakable Majesty feature?


The College of Glamour bard’s Unbreakable Majesty feature (XGE, p. 14-15) has a similar effect to the sanctuary spell, although it requires a Charisma save instead of a Wisdom save.

If someone attacks a creature under the effects of both, does the attacker need to make both saves?