I think the OP was trying to do a removal order (and just mentioned liquidation in passing when asking if other sellers had experienced problems with removals or liquidations)
Appears that the OP tried to organise through UPS themselves and did not know Amazon's EORI is to be used in this return for the necessary customs info.
Happened a couple of weeks ago for us (I'm the oriignal OP for this thread) and now its happened again. Bit concerning tbh as everything has been dispatched but added to the balance
That doesn't mean that OP isn't a target of a scam. A smart scam would look at emails that Amazon is sending and then copy that format but put their own phishing link in.
mobile app request does not work for us at all, it just gone into a loop. Whereas we sometimes get the same error as OP and if you refresh the screen a few times, sometimes it will let you request funds.. sometimes you have to come back later on.