Graph API - Send Mail error - MailboxNotEnabledForRESTAPI The mailbox is either inactive, soft-deleted, or is hosted on-premise

Vojtěch Krása 16

Hello,

I am calling graph.microsoft.com/v1.0/me/sendMail or /users/{id | userPrincipalName}/sendMail

and getting MailboxNotEnabledForRESTAPI for invited users (User type=Guest) from another tenant. They have normally working company mails and working https://outlook.office.com/mail/inbox/ so https://learn.microsoft.com/en-us/answers/questions/761931/microsoft-graph-api-throws-the-mailbox-is-either-i.html does not really apply.

It works fine from an application that belongs to the home tenant, but not from an application from a different tenant.

   {  
     "error": {  
       "code": "MailboxNotEnabledForRESTAPI",  
       "message": "The mailbox is either inactive, soft-deleted, or is hosted on-premise.",  
       "innerError": {  
         "date": "2022-07-18T05:31:14",  
         "request-id": "198d3758-f69c-449f-acbe-895b2be8fe2f",  
         "client-request-id": "198d3758-f69c-449f-acbe-895b2be8fe2f"  
       }  
     }  
   }

Different user, in a different app, this time it is a multi-tenant app:

   {  
     "error": {  
       "code": "MailboxNotEnabledForRESTAPI",  
       "message": "The mailbox is either inactive, soft-deleted, or is hosted on-premise.",  
       "innerError": {  
         "date": "2022-07-05T09:36:03",  
         "request-id": "a7dafdd7-50c9-48e2-9e57-1a84fbf73009",  
         "client-request-id": "a7dafdd7-50c9-48e2-9e57-1a84fbf73009"  
       }  
     }  
   }

Could someone diagnose this?

Thanks.

Vojtěch Krása 16 Reputation points

2022-07-19T10:47:33.54+00:00

I have now sent an MS support request...
Zehui Yao_MSFT 5,866 Reputation points

2022-07-20T06:50:56.447+00:00

Hi @Vojtěch Krása , thanks for the feedback, if you get a solidion from MIcrosoft Support, you are welcome to share it here, so that it can help other users who have the same problem. Appreciate your understanding
TruongTanChau-9387 0 Reputation points

2024-05-02T08:42:53.74+00:00

dear Vojtěch Krása, I have the same problem as you. Can you share your solution? I highly appreciate your understanding.
Vojtěch Krása 16 Reputation points

2024-05-02T09:25:12.55+00:00

There is no solution. It cannot be done.

1 answer

Zehui Yao_MSFT 5,866 Reputation points

2022-07-20T06:44:35.313+00:00

Hi, and according to my tests, if your user type is guest, you can change the {tenant} value to common or consumers, so that your account will be authenticated on behalf of the personal account.

Since the sendMail endpoint currently supports the use of personal permissions, you can use your personal account to use the sendMail feature to send emails to users within your tenant.
Hope this helps you.

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Vojtěch Krása 16 Reputation points

2022-07-20T13:30:40.757+00:00

Using common returns:

AADSTS700016: Application with identifier 'xxx' was not found in the directory 'DITA s.r.o.'. This can happen if the application has not been installed by the administrator of the tenant or consented to by any user in the tenant. You may have sent your authentication request to the wrong tenant.

it tries to use the wrong tenant - where the account is a member, not guest, and where the application is not . The problem is with guest accounts. I was told they need a license. But the user have license for “Exchange online (plan1)” which is enough for send an email. Everything work fine from home tenant. We want to send email from another tenant, where the mentioned user is invited as external guest.

consumer :

AADSTS900023: Specified tenant identifier 'consumer' is neither a valid DNS name, nor a valid external domain.

Mail.send is of course authorised.

Vojtěch Krása 16 Reputation points

2022-07-20T16:55:46.493+00:00

From MS support: " I have discussed your issue with my team. And the conclusion is, the external guest users will not have an active mailbox and we will not be able to send emails from their email address. "

wtf

Zehui Yao_MSFT 5,866 Reputation points

2022-07-24T09:48:31.307+00:00

Hi @Vojtěch Krása , please try change the {tenant} to consumers, I can test it successfully in postman tool.

Krasa 41 Reputation points

2022-07-24T10:15:07.147+00:00

We're unable to complete your request
unauthorized_client: The client does not exist or is not enabled for consumers. If you are the application developer, configure a new application through the App Registrations in the Azure Portal at https://go.microsoft.com/fwlink/?linkid=2083908.

Ramani 0 Reputation points

2023-07-11T10:55:00.0666667+00:00

Hello,
I have the same issue when I create a new appointment using the graph client programmatically in WPF ASP.Net Core and also using the valid Microsoft 365 license.

Could someone diagnose this?

Thanks

var graphClient = new GraphServiceClient( new DelegateAuthenticationProvider((requestMessage) => { requestMessage .Headers .Authorization = new AuthenticationHeaderValue("bearer", token); return System.Threading.Tasks.Task.CompletedTask; })); Event evt = new Event(); // Because my variable is a reserved word in the api, I have to poke it into something different before using it var localLocation = Location; // Body const string newLine = " <br /> "; apptBody.Append("Email: " + EditCustomer.Email); apptBody.Append(newLine); apptBody.Append(EditCustomer.Notes); ItemBody body = new ItemBody(); body.Content = apptBody.ToString(); body.ContentType = Microsoft.Graph.BodyType.Html; // using attendee to poke it into the calendar? var attendees = new List<Microsoft.Graph.Attendee>(); var attendee = new Attendee(); var email = new EmailAddress(); email.Address = SelectedEstimator.Email; attendee.EmailAddress = email; attendee.Type = AttendeeType.Required; attendees.Add(attendee); evt.Attendees = attendees; var recipient = new Recipient(); recipient.EmailAddress = email; evt.Organizer = recipient; evt.IsOrganizer = true; evt.IsDraft = false; // Event General Information evt.Subject = Title; evt.Body = body; evt.Location = new Location { DisplayName = localLocation }; // load up date and times // Start DateTimeTimeZone dtStart = new DateTimeTimeZone(); dtStart.TimeZone = TimeZoneInfo.Local.Id; DateTime dts = AppointmentDate; dtStart.DateTime = dts.ToString(); // End DateTimeTimeZone dtEnd = new DateTimeTimeZone(); dtEnd.TimeZone = TimeZoneInfo.Local.Id; DateTime dte = AppointmentDate.AddHours(1); dtEnd.DateTime = dte.ToString(); evt.Start = dtStart; evt.End = dtEnd; // Reminder off evt.IsReminderOn = false; // Create Event var createdEvent = await graphClient.Me.Events.Request().AddAsync(evt);

Mayur Saini 0 Reputation points

2024-05-01T06:19:26.4133333+00:00

Hi,

I am trying to use sendMail Graph API using, Azure API Management Instance and have created a Credential Manager instance and a Connection for the authorization. But, I am getting the same error. Please could anyone let me know, that do we need to use the authorize Graph API first?

Turk Ammad 0 Reputation points

2024-08-24T15:02:39.6566667+00:00

Thanks. Your Answer Help me a lot
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Graph API - Send Mail error - MailboxNotEnabledForRESTAPI The mailbox is either inactive, soft-deleted, or is hosted on-premise

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