Highlight the return in the EFcenter and use this, see if that shakes it loose. If not and you can see a submission ID, you may want to call your state preparer hotline number (assuming CO has a special number for tax pros) and see if they can tell whats happening n their end.
Currently there are delayed acknowledgements reported for CO returns and we are working with the state to get a status update. All known delays are posted in this report:
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Here is the message I received today from Mary Medley of the Colorado Society of CPAs:
Colorado is processing returns. Only the acknowledgement component of the system is affected, and the CDOR is working on resolving the issue. If you want to check on specific returns, you can call the CDOR Practitioners Helpline, 303-232-2419 to verify they're in the system.