meeting on guest end keep saying host in other meeting

hello. so every time we send out the zoom link in email form. people use the link to join but it keeps saying host in another meeting. while we don't have any other meetings launched. It's been an ongoing issue for a few months. we deleted that meeting and started a new one and it resolves the issue. but on the day of the meeting, this causes issues for our members as we have to send a new link at the time of the meeting. which drops our engagement.  we need to find a solution to resolve this to continue our society's activities properly. thanks