Unlinked submission
When you don't link federal and state returns, the system submits the state return independently. It doesn't include the federal return's submission ID. The system doesn't hold it until the IRS accepts the federal return. The IRS e-file system performs minimal validation checks on the state submission before forwarding it to the state taxing authority.
The state can still reject the state return if it fails the minimal validation checks or if the state taxing authority rejects the return.
The state may accept the state return before the IRS accepts the federal return.
Be careful if you materially change the federal return to get IRS acceptance. The federal return you filed with the IRS would no longer match the federal return you filed with the state. If this happens, you may need to file an amended state return.
This type of submission is also referred to as a state standalone submission.