notifications do not work on ios - flutter firebase messaging - ios

I've been blocking notifications with flutter and firebase messaging for three days
Everything works correctly on android but on ios impossible to receive a notification I followed all the steps of the firebase site, but nothing to do I do not receive any notification on my phone.
someone would have an example code that works or a solution a functional tutorial, I tried everything I found on youtube and google but nothing works

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There is SDK Documentation pages for Flutter:
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What are possible reasons for Firebase to not deliver the message to iOS? Or is it possible to see whether a delivery to APNS fails within the Firebase Console?

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