I just integrated the Alexa Player configuration.
but unfortunately no success
after re-downloading in hacs, I added the integration.
I finally reach ‘500…’ after introducing the hidden word.
I tried several times .
All devices with Alexa stopped working.
I thought re-installing Alexa integration would fix it, but I got the same Internal Server Error.
After a few digging it looks like a system error handling https.
I suspect that this is happening on custom SSL configurations (like mine), but I migth be wrong and could also apply to the Nabucasa Cloud.
I found the issue regarding adding the integration.
Solution: Enable 2FA on your Amazon account, and add the integration again following the instructions on setting the Built-in Keys in the initial integration form.