To benefit the community, posting the answer from our private discussion.
Jaffer19-9558 sorted out the issue by adjusting the WebApp to run on port 80 instead of 8080.
Thanks for the update @Jaffer19 . Much appreciate the follow-up.
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Azure WebApp only support 80 and 443 port, but you could use point to other port leveraging WEBSITES_PORT settings (for custom containers).
Configure port number
Azure App Service on Linux FAQ