Two account's confusion needed help!

I have two iTunes accounts one is for my computer (A = email) and the other for my iPod - (B = email) I made a mistake by buying a song on my (A) one and then sending it as a gift to my (B) one. but I stayed logged into my (A) one now I can’t download the song with out it showing up with this warning.

I don’t know what to do? I own both of these accounts and i shouldn’t be blocked just for making a stupid mistake.

Help me please Thank you. 😢