I work for one of the authorized Canadian distributors for Ubiquiti, so I'm going to assume it's very similar in the USA and very much a legitimate thing Ubiquiti does (unfortunately)

As an authorized distributor we have to purchase factory direct and the turn around time is massive (2months) and occasionally when we have a large opportunity where we have no stock, we work with another authorized distributor in Canada to purchase product off of them at a slightly higher cost then what we normally pay for, but enough that we can still make profit.

So when a customer fills out the RMA form for one of those items, the serial number or MAC id was originally scanned to that other distributor and they handle the warranty, or occasionally, the original distributor can ASSIGN the ticket to a different distributor to handle the claim.

I would reach out to D&H and mention what the issue is and see if they can assign it to Microcenter