Unable to add Former Members

I am not able to add to our Former Members list. When I type the names (no email address, no phone) in Quick Add and then click Save, the box simply turns red. If I then check the Former Members tab, I can see that the names were not added.

I tried adding three names at a time (one per line) and had this problem, so then I tried one name at a time. It accepted one of the three, but will not add the other two to the Former Members list.

please provide the names you are trying to add

Jennifer Gage
Richa Sharma

Jennifer Gage is in the members list you need to move her to former.

Richa Sharma is in the members list you need to move him to former.

Oh, d'uh. Of course. Thank you!