I just tried this in a dummy return.  Here's a screenshot of my data entry on screen 2.  This matches the spouse info on Screen 1.  I have it calculating the $310 credit for her.  Maybe tweaking one of the inputs is what's needed.

I do see a critical diagnostic, but 1) you might be able to suppress that in efile, or 2) duplicate the return and efile fed separate from Mass, or 3) just print it and paper file it.

Get a client onboard to try the troubleshooting of suppressing the critical diagnostic.  Let us know if that works.  Good luck!