Consistent 504 on a delta endpoint

Question

Hi, I'm trying to sync mail folders for a specific inbox using delta, however I keep getting a 504 on that endpoint - not temporarily, but consistently (have been trying for a couple days). The request times out after 30 seconds.

The URL we're accessing is the following (actual address removed).

https://graph.microsoft.com/v1.0/users/******@xelix.com/mailFolders/delta

We get an unknown error for the response:

{
  "error": {
    "code": "UnknownError",
    "innerError": {
      "client-request-id": "1f254791-afed-43c5-92c4-f8bfe0f9ca5c",
      "date": "2025-03-05T15:30:45",
      "request-id": "1f254791-afed-43c5-92c4-f8bfe0f9ca5c"
    },
    "message": ""
  }
}


```For other inboxes using the same credentials even this is just fine and we get a response promptly.

Anything we need to do differently?

Answer 1

Hi Mikulas Poul,

Thanks for reaching out to Microsoft!

Since the issue seems to be specific to a particular mailbox, I recommend raising a support case with Microsoft Graph. Please include the latest logs with the Client ID, request ID, and timestamp, 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 it. If you have any further questions about this answer, please click Comment.