Microsoft Exchange VM deployed as Azure VM cannot send emails to sendgrid SMTP relay

I have Azure trial subscription

 have came across below article

https://blogs.msdn.microsoft.com/mast/2017/11/15/enhanced-azure-security-for-sending-emails-november-2017-update/

I have integrated Sendgrid SMTP relay service with My Azure Compute Subscription and allowed SMTP traffic by setting up API keys and password.

Post that Azure VM (Exchange server) is configured to send emails to smart host (smtp.sendgrid.net) via above API key and password as authentication mechanism

However still My exchange server is unable to relay any emails to any internet SMTP including Sendgrid SMTP

i cannot contact Microsoft Azure Support because of free subscription

How I can allow Exchange server to send emails to sendgrid SMTP relay?

Thanks Best Regards Mahesh