I have tried all of the processes you mentioned and the problem still persists.
The listing is for a Campervan and I have noticed that when you highlight ANY of the Vehicle categories, ‘Buy It Now’ is not in the supported options in GS. But, when I made the listing via the eBay website selling section BIN was allowed; it also allows BIN with Best Offer option, which GS does not ?!?
I can reproduce that eBay error here and I am confused, too.
Could it be that you can’t select the GTC duration on the eBay website and have to select another duration option there in order to use GTC?
Maybe the Cars/Vehicles category doesn’t support the GTC option at all?
As I mentioned, in the end I did use the eBay website to create the listing (in Cars/Vehicles) and when you make it a BIN on the site eBay automatically makes it GTC (it’s their rules: all BIN’s are set to GTC). I was also able add ‘Best Offer’ option, and change it to a 7-day listing.
All of which throws up errors in the GS Preflight.
I also ‘Imported’ the live listing from ‘My eBay’ (under File menu) into GS, which then still reports it as with errors… even tho’ the eBay site is fine with it!
I just checked it on the eBay.co.uk website:
As I assumed, you can’t list a fixed-price item using the GTC duration option in the “Cars, Motorcycles & Vehicles” category.
That’s why I was asking whether you’re sure you could do that.
Please see my screenshot below. In that specific category you can only select 3, 5, 7 or 10 days - but no GTC.
That’s currently not possible to do in GarageSale because it will always switch the duration to GTC if you create a fixed-price item.
I put this on our to-do list and we’ll see what we can do.