Error from OAuth 2.0 provider: Error Code: ErrorAccessDenied

Question

Error from OAuth 2.0 provider: Error Code: ErrorAccessDenied

Scott Bowling 0

I am having a difficult time configuring OAuth for my 3rd party system. Historically we've used SMTP but are moving over to OAuth. I've gone through and followed the steps required for my application (FileMaker) https://support.claris.com/s/answerview?anum=000038230&language=en_US under Microsoft but I am getting the following error:

Email test failed: Test email could not be sent successfully. Error from OAuth 2.0 provider: Error Code: ErrorAccessDenied Error Message: Access is denied. Check credentials and try again.

I've double and triple checked the values entered and they do match, so this leads me to believe there is a step missing. Do I need to assign the app to the users I want to be able to access the API?

Rukmini 10,505 Reputation points Microsoft External Staff Moderator

2025-12-08T18:58:02.72+00:00
Hello Scott Bowling,

Specify the scope name to generate the token like https://outlook.office.com/SMTP.Send

For sample, I generated below API permissions:

And passed scope as https://outlook.office.com/SMTP.Send to generate access token:

GET https

And the access token contained all the Office 365 Exchange Online permissions granted to the Microsoft Entra ID application:

When decoded the scopes are present that is SMTP.Send and all other permissions granted to the Microsoft Entra ID application.

If still the issue persists, pass individual scopes like below:

scope

Let me know if any further queries - feel free to reach out!
Rukmini 10,505 Reputation points Microsoft External Staff Moderator

2025-12-09T20:34:19.4866667+00:00

Hello Scott Bowling, Following up to see if the above provided information was helpful. If you have any further queries do let us know.

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Rukmini 10,505 Reputation points Microsoft External Staff Moderator

2025-12-08T18:58:02.72+00:00

Hello Scott Bowling,

Specify the scope name to generate the token like https://outlook.office.com/SMTP.Send

For sample, I generated below API permissions:

And passed scope as https://outlook.office.com/SMTP.Send to generate access token:

GET https

And the access token contained all the Office 365 Exchange Online permissions granted to the Microsoft Entra ID application:

When decoded the scopes are present that is SMTP.Send and all other permissions granted to the Microsoft Entra ID application.

If still the issue persists, pass individual scopes like below:

scope

Let me know if any further queries - feel free to reach out!
Rukmini 10,505 Reputation points Microsoft External Staff Moderator

2025-12-09T20:34:19.4866667+00:00

Hello Scott Bowling, Following up to see if the above provided information was helpful. If you have any further queries do let us know.

Answer 1

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Error from OAuth 2.0 provider: Error Code: ErrorAccessDenied

1 answer

Your answer