Remote W-2 Consultant - How To Claim Zero Tax Liability to Colorado

Hi all,

I am a permanent resident of Washington state (obviously no state income tax).  I work as a temporary W-2 contractor for a recruiting firm based in Virginia.  They  basically "match" me with a client hospital in Colorado state, and I have been working with this Colorado hospital client for all of 2020.  The important part is that I worked 100% remotely from my home in Washington state for the entire year.  I did not travel or physically work in Colorado at all.

The issue is....I had Colorado withholding on my paycheck in 2020 for an amount of around $8,500.  In talking to my CPA attorney brother-in-law, he said I will absolutely get ALL that back.  I am not liable for Colorado state taxes if I worked remotely in WA state, and I guess it was my consulting company "being lazy" (his words) by not figuring this out on the front end.

My question - what do I need to enter or do in TurboTax (and on which form) to show that I have zero tax liability to Colorado, and thus be able to see a CO refund of $8,500 in TurboTax?

I did find a discussion on TurboTax similar to my issue, and I am especially interested in this part that states:

"If preparing a nonresident return solely to recover erroneous tax withholdings, enter 0 on the screen that asks for the amount of income earned in that state. This will eliminate your tax liability for that state, resulting in a full refund".

However, I cannot find WHERE to do this above...?  Basically, I need to see my CO Refund box turn green in TurboTax and zoom up to $8,500.  I almost had a professional tax individual do my taxes this year just because of this issue, but I am thinking this is easy in TurboTax, and I am just missing something simple.

Thanks!