Firstly, congrats on becoming a Permanent Resident in Singapore!
Yes, you do need to update your new NRIC number with us. Your personal details on GXS must match your information on Singpass Myinfo. You will not be able to log in to the GXS app on a new device if you have not updated us with your personal information (e.g. if you have a new NRIC number but registered with your old FIN number with GXS).
If you run into issues during new device registration because of a mismatch in personal details, fret not! We can process this change for you. Simply contact us at:
GXS Hotline: (+65) 3105 2055
GXS Customer Support Email: firstname.lastname@example.org
You will need to email us copies of your old and new identification documents.