The solar business credit on Form 3468 goes to the business credit Form 3800. On your 2021 return, line 5 of Form 3800 will show the carryback. I am unsure how that is entered in TurboTax.
I suspect that TurboTax won't automatically carry it anywhere, so if the business credit is not used up in 2022 or 2021, then you probably need to manually enter the carryover in 2023.
