it seems like when they created their account they may have signed up for a 30 day trial subscription for an Organizational Account. These trials do expire. They do have the option to convert the trial to a free, public account. The will need to do this from the My Organization page.Thanks,Mike
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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