Can't efile if filing 8615 with pre-TCJA rules

Since form 8615 was FINALLY released, I went back to complete the returns for our two college-student children who each have unearned income over the threshold due to financial aid that was used for room and board.

 

HOWEVER, once completed, I receive an alert that their returns cannot be e-filed because "You have indicated on Form 8615 that you are electing to modify tax of unearned income." This is a tax situation that Turbo Tax does not support for e-filing. This is apparently tied to my answer to the question of calculating taxes based on pre-TCJA rules. When I went back and answered "No" to that question, my son's tax amount did not change AND we were able to e-file. Just thought I would point that out to anyone who might fall into the same situation.