Please re-post your code formatted correctly. Use the </> button. Should look like this:
mqtt:
sensor:
- name: (uzw)
You have pasted it as a blockquote, which destroys indentation and exchanges “real” quotes for “smart” ones. There might be errors in your code that are not apparent to us.
If this is your first MQTT sensor in the configuration file, you must restart HA to load it up.
If that doesn’t help, please paste a screenshot from MQTT Explorer showing the topic and the data.
Where are you trying to “select the entity”, and what does the error look like?
Have you set up your MQTT broker in HA? Do you have a screen like this under Integrations?
