@SayakB The error message indicates an issue with access, which could be due to incorrect or insufficient permissions. You should check the Azure app configuration and the SSL certificate.
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Pega Platform only supports the Application permission type, so when registering your application with Microsoft Azure, select application permission type, instead of delegated permissions.
Pega supports delegated permission in addition to application permission.
The problem was different :Although my Service principle has Mail.Send delegated rioght it did not work because the mail box was a shared box. In such case the desired access role is **Mail.Send.Shared (**in delegated access mode)