The steps which need to be followed by the user taxpayer for changing of email and mobile number: –
Step-1: Login to GST portal (http://www.gst.gov.in/) with your user id and password.
Step-2: Click on the registration bar and select the non-core amendment.
Step-3: Click on the authorized signatory tab.
Step-4: Add new authorized signatory whose email and mobile number user wants to use.
Step-5: Go to verification tab and submit the application.
Step-6: After submission of application please wait for some time ( 15 minutes).
Step-7: Login again with user id and password.
Step-8: Go to the authorized signatory tab – deselect the primary authorized signatory check box.
Step-9: Select the newly added authorized signatory as primary authorized signatory (Important: Older mobile and email id will be prefetched by the system. Please ensure to change the mobile and email id to which you want to add.)
Step-10: Go to the verification tab and submit,
[Note: For Company/LLP DSC will be allowed. For EVC submission, OTP will come on newly added email/mobile number]