I am new to HA and Tailscale. I added Tailscale in HA and later to my Android S22 phone. But than I can’t get remote access to HA. I got “connection failed”. When I wait I get the message “connection time out” … http://192 …:8123 … so, with the webadres I use for connecting HA on my PC.
When I look at “machines” at tailscale on my pc, i see home assistant end my phone as “connected”
May be somebody can help me!
How is HA installed?
How is TS installed?
Can you test from pc or try ping?
HA is installed on a mini PC.
TS is installed via the add-on “Tailscale”.
TS app is installed on my samsung android S22
When I Ping on my S22 the adress of Home Assistant 100.83… (see attachment) it works!
But when I start HA on my S22 the error “connection time out” displays the IP adres which I use on my PC to connect to HA.
So my idea is that HA on my S22 via 4G uses the wrong adress, but … I am new in this knowledge area 
If you’re using the HA companion app, there was a release this week to solve login issues.
Can you check if updating the app solves your problem?
I did the update, but does not solve my problem 
Try a browser on your mobile. If that still doesn’t connect, it’s not an issue with the app
Ok, but when I Ping on my S22 the adress of Home Assistant 100.83… it works! But when I start the HA app I get the failure, also when I type the address in the chrome browser on my S22.
Look at http: section of HA and trusted proxies. This could be issue.
Reading the addon docs it seems that HA should
Use https or you need setup for using http. In both case you need some config changes. Did you do that? It look like you specifically should not connect at HAip:8123 and I got impression that you were testiing this.
Under the DNS tab, is MagicDNS enabled? I believe it’s enabled by default but check if it is.
That feature makes your local network’s host names available on your tailnet. The host named homeassistant on your local network should continue to be found by the same name on your tailnet.
Double check that the HA app is configured to find your instance of Home Assistant by the machine’s host name, not the host’s IP address on your local network (192.168.xxx.xxx).
Yeah that seems right. Use the hostname, not the IP.
Ok, MagicDNS is enabled.
I can add the machine its host name at two locations in HA on my S22
So … what do I wrong???
According to the first screenshot you posted, the hostname of your machine is homeassistant.
In your second screenshot, see where it says Home Assistant URL?
Change its value from this:
http://192.xxx.xxx.xxx:8123
to this:
http://homeassistant:8123
This is great! Thnx a lot, its working
You’re welcome!
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This also fixed it for me! Thank you! Have been having the same issue as OP.
Done!!!