Getting state specific info from this volunteer forum is always a little iffy, simply because there isn't usually anyone reading a particular question with experience in that particular state (except for the big ones like CA and NY).
So I don't know the answer about CO and foreign taxes. You don't have to claim a foreign tax credit deduction. As long as you report the income you are ok. But of course if you can claim a credit/deduction that would be great. I would expect TT to ask you about it or automatically transfer if it could.
This link says you cannot get a CO foreign tax break unless you earned wage/self-employement income while living overseas. I do not know if that is correct.
https://www.myexpattaxes.com/do-u-s-expats-need-to-file-colorado-state-taxes
this from the CO tax dept talks about a credit for taxes paid to another STATE. You would have to do some research to see how "state" is defined. If broad enough, it might apply.
https://www.colorado.gov/pacific/sites/default/files/Income17.pdf
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