Hi @Cynny SpA ,
According to your description, your issue is more related to development, which we do not support. I will provide some suggestions for your reference. Hope this can help you!
Based on my knowledge, Microsoft Graph offers two API sets that arrange and join online meetings on Microsoft Teams: Calendar API and Cloud communications API. In Cloud communications API, you can use the videoTeleconferenceId property to complete it. For more details, you can refer to:
https://learn.microsoft.com/en-us/graph/choose-online-meeting-api#comparing-the-apis
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.