Unable to submit my new app to App Store

I am able to save the app release info with screenshots (added all); I am able to build & upload to app store connect; I am able to release it to TestFlight as well.

Now the problem is when I am submitting it to App Store, this error comes up in red : "There are one or more errors on the page". Surprisingly, there isn't anything highlighted on the entire page

Screen record (unlisted permission): https://youtu.be/Wh7ibx1MrgE

I have been trying to reach out to Apple support for last 10 days, and I have no update yet. I am unable to figure out the issue. My app is working smooth on TestFlight as well!

please help here!

I am getting this error in the submit for review ajax call : "Validation errors"

Endpoint: submit/summary

Part of the response json

... 
"messages": { 
    "warn": null, 
    "error": null, 
    "info": [ 
        "Validation errors" 
    ] 
}, 
...

And none of those `errorKeys` has any error