Hi
This issue I raised to Power BI support team and they fixed and informed as below:
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Based on your message, I will go ahead to close this case for you. The case has been marked as “bug”.
Here’s the case summary for your records:
Problem Description
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In Power BI Apps, it showed content not available message if the user machine is located in South East Asia.
Cause
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It is a bug regarding extended Pro Trial account on authentication
Resolution
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A fix has been deployed to the production and the issue is gone.
It was my pleasure working with you!
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So my embeded report is working now. Hope it will work for you also,
Thanks for your reply