We are having an issue with multiple offline (all 3) areas not able to download in Collector, however the maps open and a offline area can be downloaded in Classic. I have attached the developer troubleshooting log for reference.
It may be best to open a case with Esri Support services. I would provide to them the following information:
サインインしたメンバーは投稿、更新のフォローなどができます。初めてですか？無料アカウントを登録してください。
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