I can interact here. But imho discord (or any other chat) works better for me.
About the connection. My instance of HA is not cloud based because it runs on my server. Made a reverse proxy that i entered as external address in my HA app so i don’t need to subscribe for outside access.
That brings me to the connecting part. My reverse proxy looks like xxxx.username.synology.me. So if i use this and left the port number unchanged (so it is 8123) i cant connect. But when i delete the port number it gets me to the HA login page. After logging in i get the error i showed in my op.
Thnx to @Mike1233 for providing me with this topic. I found out that my synology ddns and reverse proxy needed a port forward for homey to connect. Now i added my devices.
Unfortunately all these added devices are ‘unavailable’ when i click them. Also i don’t see the AC’s i added in HA in the list of available devices. So these are two issues that i got to sort out before even buying a Homey (sub) myself since i want to control my climate with it. But that’s stuff for another topic i guess 
Thnx both for replying and helping!
