Thank you so much for the detailed reply.Good to know. Not so good this has happened. Please keep the forum apprised how this goes for you.
In the meantime, it appears there is another victim to add to the growing list of citizenship applicants burdened with the PPQ - QAE:
I am hoping @Voltron123 will confirm whether the "background check" referenced is the PPQ-QAE or not, and also join the discussion here, adding his or her how it goes reports to the discussion.
By the way, @Voltron123, if what you received is NOT the PPQ - QAE, please share with us the title of the correspondence or requests you received, and also look at the lower left hand corner of any part which is clearly a form and look for its formal form number . . . such as CIT 0171 or CIT 0520 or, the one being most commonly reported these days, the CIT 0205 form . . . and let us know which it is. It would be appreciated. There is a lot to learn about these procedures, still, so whatever additional information those affected can provide, the more we can organize, collate, and digest what we know, so we can better help those affected, whether that is helping them understand what they need to do to appropriately respond, or helping affected applicants understand better what this means and how it will affect their application. We can extrapolate some from prior procedures, like the standard RQ (CIT 0171) or its cousin, RQ-lite (CIT 0520), including what was learned during the huge surge in pre-test RQ that occurred during the Harper government years. But the more we learn about what is happening in regards to this relatively new procedure, the more forum participants can help one another best navigate the way forward.
By using the term "background check" I meant PPQ & QAE. I read some of the posts here and the required documents are the same.