Well can't comment directly on this issue you raised, but do you think there are no issues with subscribing/streaming directly with services like Netflix, HBO Max, and Paramount + for some examples? go take a subscription with Paramount + on your Amazon Fire Stick. Oops, you can't watch a bunch of their video content.
You get error code 6013. Clearing the cache, force stop, uninstalling, and reinstalling do nothing. Finally, if you're lucky with Googling, you find the crapy solution. You have to reduce your resolution from 2160p-60hz to 1080p-60hz.
Code:
https://www.amazonforum.com/s/question/0D56Q0000CeKfsISQS/paramount-on-fire-tv-giving-me-error-6013-and-preventing-viewing-of-any-conte