I remembered we answered a payroll question last time, under a ProSeries topic:

https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/employee-retention-cred...

Regarding ERC, that is an example of something in 2021 that is further complicated by this mess, if that was the same business and the same "two different owners, not the same LLC, but the same EIN" problem.

There is too much to straighten out here, for anything to be filed right now. And ProSeries has none of these tools.

Whichever payroll tools you are using, you should be getting outside help to first fix this mess. Then, to execute those fixes, you use the Payroll tools, not ProSeries.

You seem to be in the wrong place on the internet, because you keep asking about Payroll.