One more try. I just uninstalled my 360 ios from my iPhone SE (gen 3) on iOS 26.0.1 and restarted the phone. Went to Apple App Store app and installed 360 again and was presented with this screen.
First screen I see…
Clicking Redeem a subscription brings up…
I click on Sign in with Norton account and I see…
Filling in my Norton Account email address and tapping on continue brings the password page. Fill in the password and you see this page while the app is activated.
So I’m not sure where your experience gets different from mine. If you still do not get what I experienced, and want to try to get Norton on your device, you can use the link to Norton Support. They have the ability to connect to your device to try to sort things out.
Please post back if you have any updates that might help others.