Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
Not able to send mail.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(83.2, 24%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDG%3C/text%3E%3C/svg%3E)
Devin Goodson
20
Reputation points
Not able to send mail. I have register app on azure. I also give all permissions including mail.send & also granted admin consent. But still giving unauthorized error while sending mail..
Kindly refer screenshot attached...to check which url I used.
Note: i. I have successfully generated access token & using it I tried to send mail.
ii. But we are able to send mail using Microsoft Graph Explorer. But when we tried same using postman, it fails.
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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Andy David - MVP 160.2K Reputation points MVP Volunteer Moderator2025-04-21T18:25:40.9366667+00:00 What permissions did you consent?
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Devin Goodson 20 Reputation points
2025-04-22T05:54:11.1166667+00:00 Application Permission:
mail.Readmail.ReadBasic
mail.ReadBasicAll
mail.ReadWrite
mail.Send
user.Read.All
user.ReadBasic.All
These are the Application permissions I had provided & 'granted admin consent for default directory.'
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(278.4, 45%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAV%3C/text%3E%3C/svg%3E)
Akhilesh Vallamkonda 15,275 Reputation points Moderator2025-04-22T14:04:13.9333333+00:00 Can you help me with the error screen shot of response body and console page which has shown in the bellow image click Highlighted part and share the screenshot of the response please
If you see the error code InvalidAuthenticationToken and Access token is empty this error typically occurs when the access token used in your request is invalid or not properly configured.
To resolve this issue, add the Client ID, Tenant ID, Access Token URL and Client Secret in the Authorization header and use the token which as shown in the below image
Hope this helps. Do let us know if you have any further queries by responding in the comments section.
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Devin Goodson 20 Reputation points
2025-04-23T09:28:47.2+00:00 @Akhilesh Vallamkonda
Thanks for looking into this issue...I have passed all correct client creds, & even when I hit Get Profile request through postman using url https://graph.microsoft.com/v1.0/users/******@Svcmulesoftoutlook.onmicrosoft.com,I was able to get profile details.
So, it seems that this is not access token or auth headers issue...
But when we are trying to /sendEmail, it is giving unauthorized error...
Even though we have given all required permission to our connected app including Mail (mail.send, mail.read, etc....)...I think that there could be the issue with connected app....
Please find attached screenshot of body and console of postman, Console Logs .txt file & also the screenshot of permissions we have given to connected app...
Postman Console Logs Of Send Email.txt
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Akhilesh Vallamkonda 15,275 Reputation points Moderator
2025-04-24T07:14:43.93+00:00 @Devin Goodson
I hope the suggestion provided by Rukmini was useful. Could you please let me know if it addressed your question. -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous2025-04-25T05:40:00.73+00:00 @Devin Goodson, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, please respond with more details and we will try to help.
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