If you do not wish to try and contact them by phone, it should be fine to give them the Form 1095-A that they have requested, and if you include your child's Form 8962 showing the allocation matches your allocation and adds up to 100% but not more, that should resolve their question. There were no changes to your Form 8962, so another should not be required.
They send out a large number of Letters 12C every year and it is a very, very common thing for them to review the Premium Tax Credit. If they need anything else, they will respond back with specifics. Sometimes the Marketplace data shared with the IRS just needs to have an update.
I recommend to make a copy of the letter and send it back with your forms, so the person processing it can easily see what was requested and I always keep a copy of anything I send.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
