Unable to Update Apple ID Settings

Hello, arindamfromthane.

Thank you for using Apple Support Communities!

Have you recently made any changes to your Apple ID? What to do after you change your Apple ID or password - Apple Support

Are you able to sign in with your Apple ID and password on the Apple ID account page? Manage your Apple ID - Apple

For more solutions, see if anything in this article helps: Get help with iCloud - Apple Support

Let us know what happens! Take care.

Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch

Try a forced restart.

Reset Device

You are welcome.