Firstly, just to clarify, I don't work for AIB.
Their official line is that each case is looked at on a case by case basis.
However, if both employers are availing of EWSS I can't see them approving a drawdown, depending on the sectors.
But I'd contact them again once you've confirmed that your wife's employer is no longer availing of it. You need to talk to a mortgage advisor in AIB as they may have a timeframe, or tell you what evidence they need before they reconsider. Revenue only published the list for any employer that received EWSS during 2020, they don't provide updates of those no longer receiving it.
If you are getting nowhere, I don't usually recommend using a broker, but it'd be worth contacting Dowling Financial to guide you. Michael Dowling has brought attention to this specific topic through the national press, and should be in a position to tell you the criteria of each bank currently.
I've no connection with Dowling Financial.