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Amazon is now automatically playing fullscreen video ads on Fire TV
(9to5google.com)
This is a most excellent place for technology news and articles.
I don’t know how to fix your problem but I am curious about it.
I assume you have an old iPhone tied to your iCloud account. What happens if you untie that phone and wait like a day (some iCloud stuff is weird and can take about 24 hours to update server side info)
You can enter the credentials manually. I just did it few weeks ago.