paypal postage labels not accepted at postoffice

Is there a reason why some post offices won't process prepaid Paypal  Royal Mail postage labelled packages?  The tracking number seems to come up automatically on Sold listing of the item on ebay when the label is purchased so is there a need for a paper Post Office receipt anyway to prove posting?  Advice please.

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tobiasd4
Experienced Mentor

PO's are not supposed to refuse these labels, some smaller ones will as they don't get much for accepting them,

find a different PO.

You have to take parcel to PO to get POP, otherwise you can't prove you posted it.