When you debloat your fire stick Amazon Prime will not work.
There is a new Debloater system out on 6/21/20. Go to You Tube > TechDoctorUK >
“Speed Up Firestick by Removing Amazon Bloatware.”
This will describe the Amazon Prime fix. I deleted the “old” install and tried the new one & it works.
@jjeffrey has the correct answer. Watched it yesterday, and it works.