we are downloading the current eBay URLs from com.ebay.developer.DetailNameCodeType.URLDetails
There wasnt a problem with this until late 2020.
In Live Version this still works okay., in Sandbox we are getting not working links. I have seen in other forum Threads that you suggest to use http://sandbox.ebay.com/itm/ .
Thats "ok" if i manually edit the link and just want to view the item on ebay sandbox. When i download the Base Data again it get overwritten.There are different links for each ebay site which i get by that URLDetailsType Call.
--> this seems still to work. So not all of your links are outdated.
I can not post to "Premium Support" but we are even getting Customer tickets who are complaining that the sandbox link doesnt work - some seems to test their new Products with it. They might now think to complain on your support.
So we need a working final solution. The easiest way would be to make URLDetails deliver the correct links in sandbox again.