If you’re trying to complete delves or the Zekvir ?? before it goes away and Brann doesn’t use his abilities there is a workaround.
- Visit Brann at the delver’s headquarters in Dornogal (across from the Vault)
- Click to configure on his portrait and select his role that way.
or
- Open the group finder window, default key is “i”, go to the delves tab, and change his spec there.
For whatever reason, using the supplies at the delve entrance is broken so you have to go back and forth from the city to change anything.