I had this problem last week and called eBay customer service and found the solution:
For some reason they had removed the best offer option from the default (quick) listing page. You need to switch to using the "Advanced" listing tool instead of the "Quick" listing tool. Then, the best offer option will show up, as well as some other things that are not visible on the quick listing tool. (To do this, 1) click on the "Sell" link to the left of the "My eBay" link at the top right of (almost) any eBay page. 2) click on "Switch to advanced listing tool" at the top right of that page."
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ミュートしたユーザーの投稿です。
投稿を表示ありがとうございます！参考にさせていただきます！
ミュートしたユーザーの投稿です。
投稿を表示Best Offerが設定できない他の設定をしている可能性があります。
例えば、variation出品の場合にはBest offerの設定はできません。