Colorado just issued a delay in accepting efile returns to sometime in Feb.  I can't remember the date for sure, but I think it is mid February.  

You may want to check their website.

None of my Colorado returns have been accepted yet as of 02/21/25, all are showing transmitted and show received by agency.    I've checked the state website, with no luck.   

Is anyone else experiencing the same delays?

I think you should try transmitting again, your error indicates a problem sending.

I wish this were available for ProConnect https://accountants.intuit.com/support/en-us/help-article/partnership/understanding-e-file-transmiss... so you will need to somehow translate it work with the ProConnect E-File Dashboard

Yes, they are still not accepting returns.  I had a client in CO that I told her I was not sure if they were accepting yet on Thursday, and she said yes, she saw it in her newspaper that they still were not ready.  So, I would not worry yet.  

I was glad she saw it because just like you it is hard to find the information. 

https://tax.colorado.gov/news-article/colorado-department-of-revenue-announces-income-tax-processing...