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Graph API - send emails - 401 - Unauthorized from the endpoint - access token is empty

New Contributor

I am able to get a token from the Graph API using an OAuth2 account client credentials, but when I go to use that with an http client snap, I get a 401  - Unauthorized from the endpoint error message.  The snap adds the access token to the endpoint like:<mailbox_email>/sendMail?access_token=<tokenguid>

I am able to use the same client application to send emails with the same mailbox in Postman.


Looking at the error in debug, it says my access token is empty.  Do I need to change something in the account to fix that?