How would you get the push notification works on IOS?

I build an App in flutter and implement the push notification. The push notification is working well on Android, but not in IOS.

Sometime, when an IOS phone install the App, it doesn't capture the token for push notification. I don't know why.

My question, when is the right time to capture the phone token for push notification? After the onboard? or a button inside the App to request permission and capture the token.

At the moment, I request the permission for notification after user onboarding.

I check my firebase database and noticed some user has the notification token, and some don't.

What is the right step to implement and capture the user phone token so the push notification can works.

Thank you.

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