DPD “Failed Parcel”

We have tried to drop a parcel off a couple of times at local stores (that we’ve used plenty before) and both have successfully scanned the parcel but then told us that it then says a few minutes later that the parcel failed and gave us a receipt to that effect.

I work with couriers daily as part of my job, and this has got me stumped. We are contacting Vinted support to ask them if they can advise the customer to choose a different courier, not even sure if it’s possible.