Power BI desktop - Login Error

We are evaluating Azure IOT in our department.

For same we have tested Azure Portal Free Account for various services.

Now in order to test visualization using Power Bi Desktop Free Try account, we are facing following issues.

On click "Try Free" and entering orgnization email address, we came across following message

On clicking "Sign In", signing got failed with following messages

Please help us to understand the error and solution to overcome this error.

Thanks...