Obtaining Microsoft Graph Client ID and Secret
Open Azure App Registration and select New registration
Name your application
Set Who can use this application or access this API? to Accounts in any organizational directory (Any Azure AD directory - Multitenant)
Set the Web redirect URI to
<Cal.com URL>/api/integrations/office365calendar/callback
replacing Cal.com URL with the URI at which your application runs.Use Application (client) ID as the MS_GRAPH_CLIENT_ID attribute value in .env
Click Certificates & secrets create a new client secret and use the value as the MS_GRAPH_CLIENT_SECRET attribute