Help Needed with iTunes Store Prompt

I am upgrading from an older iPad to a new one. I did a transfer from the old to the new (using that circle in the picture trick), then restored from an iCloud backup from yesterday.

It went mostly well, except it is constantly prompting me to input the password for an old Apple ID (which isn’t even mine - it’s an old one of my husband’s) for the iTunes Store. I don’t know the password to that Apple ID, and I can’t figure out how to switch it to my iCloud ID.

A few notes:

1. My iCloud is set up with the correct Apple ID.

2. My husband and I don’t have access to that old email anymore, so I can’t switch my iCloud account to the old email address temporarily. I saw a thread advising that, but because I can’t get into the old email, I can’t do it.

3. I have no idea which apps/songs/other content are associated with the old Apple ID, so I can’t delete them. I have no idea how this backup came to be associated with the old ID anyway.

Any help would be appreciated!

Thanks.