I have a s9 plus and i tried to login through the my starhub app. It kept on saying i am not linked to any billing account but i have just linked my hub id to my billing account on my computer. I tried to re-install the app but the issue was still there
Updates via My Account Manager (MAM) may take up to a day to process. You may wish to check again via https://login.starhubgee.com.sg/VCRLS/login.cgi to ensure that your Hub ID is linked correctly.
My apologies for any inconvenience caused.