You can retrieve meeting information via joinWebUrl.
This option is available to support use cases where the meeting ID isn't known but the joinWebUrl is, such as when a user creates a meeting (for example, in the Microsoft Teams client), and a separate application needs to retrieve meeting details as a follow-up action.
GET https://graph.microsoft.com/v1/me/onlineMeetings?$filter=JoinWebUrl%20eq%20'https%3A%2F%2Fteams.microsoft.com%2Fl%2Fmeetup-join%2F19%253ameeting*********'
You can refer to the attached screenshot-
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