I was separated from my husband, and his bank account was attached to this credit, so it all went to him, and I didn't receive any of it. Do I still have to claim it?

[Critter-3]

You must enter your portion of the  Advance Child Tax Credit information from YOUR  IRS Letter 6419 here:

1. Open your return.
2. Click on Federal tab under Tax Home.
3. Click on the Edit/Add button next to Advance payments, Child and Other Dependent Tax Credits (under Your tax  breaks).
4. Answer the interview questions.  

Even if the other spouse got all of the advance ... this is an issue you need to take up with your attorney. 

[AmyC]

If audited, and you can show that you did not receive it, you should not claim that you did. He should claim what he got.