How to solve issues with TTS?

Hey,

there are several posts discussing problems with TTS and I already tried serveral things to get TTS working, but without success.

For example:

Unfortunately, I didn’t find the folder /etc/letsencrypt in my HA Installation. I am using Hass.io followed the instructions from https://www.home-assistant.io/hassio/installation/. Maybe this is the solution? But where are these files?

All in all, TTS is not working, I dont know why. I am using Samba, DuckDNS with SSL (set up in configuration.yaml) and there are no errors in the logs.
I have a public domain and the SSL certificate isl valid. My configuration seems to be correct (I already tried some things from other posts discussing the TTS problems).

http:
api_password:
base_url: https://mydomain.duckdns.org:8123
ssl_certificate: /ssl/fullchain.pem
ssl_key: /ssl/privkey.pem

tts:

So, any suggestions?

I just noticed the following error:

media id must be spotify
components/media_player/spotify.py (ERROR)

EDIT:
I am a fool. I cannot play TTS via spotify. I have to set up a media player, right?
But which media player? According to https://www.home-assistant.io/components/media_player/ I have to use one of these platforms?
Is it possible to add a speaker to my system running HA ? At the moment, I have only a echo dot and a Libratone Zipp…

you need an output device (media_player) to receive the audio.