Hello Deepugly,
Thank you for using Apple Support Communities. We want to help troubleshoot and isolate this issue you're experiencing when trying to use the App Store. You mentioned that your password isn't being accept. If so, let's test the following steps below:
1.) Visit the Apple ID website and try to sign in. This would be a great way to further isolate sign in issues.
2.) Connect to a different reliable Wi-Fi network or even test on your cellular network.
3.) Make sure there are no VPN or configuration profiles installed. This can cause interference
4.) Try refreshing your iPhone by restarting it: Restart your iPhone - Apple Support
5.) Install pending updates that might be available for your iPhone.
This can usually help with unique issues, since updates include fixes. Just in case, this link can guide you through the update process: Update your iPhone or iPad - Apple Support
1.)Back up your device using iCloud or your computer.
2.)Plug your device into power and connect to the internet with Wi-Fi.
3.)Go to Settings > General, then tap Software Update.
4.) If you see more than one software update option available, choose the one that you want to install.
5.) Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do: If you forgot your iPhone passcode - Apple Support
Also, if your password isn't being accepted while trying to update apps, you can try to delete the app and redownload it.
We hope these steps help you out. Thank you for using Apple Support Communities. Take care.
