I don't know how this works, may be due to account or location, but when I was back in my home country I was able to upload the app to store. For some work I travelled overseas which changes my GEO Location, and after this change I was not able to push the app to AppStore.

So I connected with my team member back in my home country and asked him to checkout code and some needful settings and uploaded the app. It got uploaded to app store without any issue. From overseas location I am just able to upload the app to testing pipeline environment.

Don't know why its related to location, but somehow it solved my issue.

Thanks.