How do you know it is not compliant? Do you get an explanation from eBay? According to our information, non-https links to the eBay platform are allowed.
Once we figured out what the reason is, you can bulk-revise any number of selected listings in GarageSale.
Not automatically. You have to use the "Import from My eBay" command. There is an option to only import listings that GarageSale doesn't know about.