Allow guest to be added to the second option of an invite.
The invitation option only allows guests to be added to the first option. When creating an invite with the options of something other than YES or NO, (e.g. FRI or SAT), it would be nice to include guests.
I’m able to add guests when the response text (e.g. FRI or SAT) is set to anything, as long as the type of yarplet is an “Invitation.” If you select “Survey” instead, you can’t add guests, which is what I think might have happened in your case. Please edit your yarplet and make sure that you’ve selected the “Invitation” option.