Sorry, I meant I-864a for his wife. It is not technically required, but it is always a best practice in a visa case. It will not solve your problem. You can respond by explaining that the joint sponsor (name) is self employed, and receives no W2 or 1099 forms. This is a common mistake from NVC when using self employed joint sponsors. His 2023 profit and loss, is ok to submit but his current income is the number called "total income" on the first page of his 1040. Is it clearly high enough?