Solved
I have already finished processing and paid for it so I can look at the actual tax forms. Where it should say 'married filing jointly' on form 8936 (line 5), TurboTax entered the numeral '2.' After that point it looks to have given up and not processed the rest of the form.
The number 2 on line 5 is a code for Married Filing Jointly. Because you transferred the credit to your dealer, there's no credit to generate for the rest of the form.
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