Amazon FAQ update (Feb 2025):

Starting August 20, 2025, any apps downloaded from the Amazon Appstore will not be guaranteed to operate on Android devices.

Another reference
https://www.androidauthority.com/amazon-shuts-down-android-app-store-3528170/

Amazon Appstore will continue to be available elsewhere, including on Fire TV and Fire Tablet devices. If you have a Fire tablet, you can purchase the Amazon version of iReal Pro. However you should be able to install your Play store apps and purchase from the Play store as you normally would.

Instructions or search for similar: https://www.howtogeek.com/232726/how-to-install-the-google-play-store-on-your-amazon-fire-tablet/

[This information as at March 2025]