For those Returning items and the Seller have paid for the Postage thru Ebay and or the label does not have address, hope this helps.

if you get a message from Ebay with a "print the postage label" link and takes you to a page where it only show 'Tracking Details' and nothing else then their system is broken (see screenshot 1). So you will need to get in contact with their 'Customer Service' and they will send you a complete and proper 'Postage Label' (see screenshot 2) & with this all i have to do is take it to the Post Office which they will accept without questions.
Note: i tried 'Live Chat' but the agent on the other side is hopeless, just disconnected on me without a reason.
Best is get them to 'Call You' - in my case i only waited 1 minute

To get Help for 2023:

Using your Mobile: My Ebay -> Help -> Contact US
Using web browser: Help -> Contact US