eBay has a 10 variant limit for all new users which means your account is limited with products it can push to your eBay store. If you've just opened your eBay account, your listing limit will be lower. However, once eBay confirms your identity, you'll be granted more listings. To avoid that, you can request a higher variant limit for your new store. Keep in mind that your store needs to be active for at least 30 days before you request the limit increase.