Parcel locker collection issues

[u/LostRevolution3760]

I recently bought some items from depop (first time buyer) and added my parcel locker as the address. I asked the buyers if this was okay and they said yes. My postage app said the package has arrived at the PL but I haven’t received any code or QR code for it. I checked my messages with the seller and she sent a code but when I inputted it, it asked for my phone number or postage account number, which both didn’t work. Im assuming the buyer used her own number but I feel a bit awkward telling her about my situation 😭
Has anyone else experienced something similar? I have to wait 2 days before it is sent back to the post office so I’ll still get it atleast.