Hi Mark Spritzler,
Thanks for reaching out to Microsoft!
For subscriptions related [Inbox messages](https://learn.microsoft.com/en-us/graph/api/subscription-list?view=graph-rest-1.0&tabs=http#:~:text=Sites.ReadWrite.All-,message,Mail.Read,-offerShiftRequest%0A(/teams/%7Bid), the following permissions are required for delegated: Mail.ReadBasic ,Mail.Read, Subscription.Read.All
Before creating a new subscription, list all existing subscriptions using the following endpoint:
GET /subscriptions
This will help you check if a subscription already exists for the same changeType
and resource
.
Get specific subscription, GET /subscriptions/{subscriptionId}
, if you find duplicate subscriptions with the same changeType
and resource
, you can delete them.
If the issue persists, I recommend you raise a support case with Microsoft Graph, a Support Engineer will be able to look into this issue and assist you better. You can raise support ticket from New support request - Microsoft Entra admin center or https://admin.microsoft.com/#/support/requests.
Hope this helps.
If the answer is helpful, please click Accept Answer and kindly upvote. If you have any further questions about this answer, please click Comment.