A couple of my players have told me that they can not choose spells for both the Spell Mastery and Signature Spells feature. When trying to choose a spell, no spells actually pop up.
I can't speak to Signature Spells (my wizard isn't level 20 yet), but for Spell Mastery there is a way to choose spells:
On the D&D Beyond app, go to the character sheet.
Go to "Features and Traits."
Swipe down to "Spell Mastery" and tap on it.
Tap on "Manage Spell Mastery."
Tap on either dropdown. The dropdowns here have spells in them.
The dropdowns don't work in the character sheet if you're using D&D Beyond through a browser rather than the app.
The dropdowns don't work in the Character Builder for either the app or on browser.
Even the working in-app dropdowns don't fully work.
If your spellbook includes any non-wizard spells that were added to the wizard spell list by another feature, such as an Eberron species or Strixhaven background, those spells are unavailable (I can't choose Healing Word as my Mark of Healing Halfling's 1st-level Spell Mastery).
The dropdowns let you select any wizard spell of the appropriate levels, not just spells you know/have prepared.
A couple of my players have told me that they can not choose spells for both the Spell Mastery and Signature Spells feature. When trying to choose a spell, no spells actually pop up.
I can't speak to Signature Spells (my wizard isn't level 20 yet), but for Spell Mastery there is a way to choose spells:
The dropdowns don't work in the character sheet if you're using D&D Beyond through a browser rather than the app.
The dropdowns don't work in the Character Builder for either the app or on browser.
Even the working in-app dropdowns don't fully work.