how to fix "OrganizationFromTenantGuidNotFound" while sending Email using Graph API

Question

I am trying to send an email using graph APIs and keep receiving "OrganizationFromTenantGuidNotFound" not found. I am attaching the entire error message below:

{"error":{"code":"OrganizationFromTenantGuidNotFound","message":"The tenant for tenant guid
'6550df3....' does not
exist.","innerError":{"oAuthEventOperationId":"292c502.......","oAuthEventcV":"bMbl6GVQFjl......","errorUrl":"https://aka.ms/autherrors#error-InvalidTenant","requestId":"b6a75333-cd2a-438.....","date":"2024-08-29T12:53:50"}}}

Here is what I have done so far:

I have received code using

https://login.microsoftonline.com/{tenant/oauth2/v2.0/authorize?client_id={client}f&response_type=code&response_mode=query&scope=offline_access%20User.Read%20Mail.Send&state=12345

received bearer auth using

https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token

and finally when I make a request to

https://graph.microsoft.com/v1.0/me/sendMail

it gives me the above error. I have a personal microsoft 365 subscription enable on my personal microsoft account that I am using for the entire process

any help in this regard would be great, thanks

Answer 1

Hi @Umer Zahoor

If you are trying to send an email on behalf of a personal account, do not use the /{tenant id} endpoint to request a token, as it only supports organizational identity login. You should use the /common endpoint to log in to a personal account, and you also need to ensure that your application supports personal account login.

Additionally, if you are sending an email on behalf of an account within an organization (tenant), you will need an enterprise-grade MS 365 license, as accounts within an organization are work accounts.

Hope this helps.

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Answer 2

See:

https://learn.microsoft.com/en-us/answers/questions/1190977/organizationfromtenantguidnotfound