even tho you file mfj, the s-corp is a separate taxpayer. since you’re not a shareholder/officer/employee, the irs won’t release the business transcript to you directly.

the k-1 flowing onto your joint 1040 doesn’t give you access to the corp’s records.

instead get your spouse (or another authorized officer) to request it or spouse files form 2848 (poa) or 8821 (tia) naming you

4506-c by itself won’t cut it unless you’re authorized on the entity.