Home Assistant (Re)Discovery Issue After Changing the Device Name

Sorry for a noob question... It is my first attempt with OB...

I have flashed a Tongou DIN Smart meter and breaker (BK7231N) device with OpenBeken FW. It runs, got MQTT connection and made it discoverable in Home assistant. I then realized that the device name and MQTT topic was not properly set. I have changed them (device name, MQTT topic...) on the client side.
The changes did not reflect on HA side, so I decided to remove it, hoping I will be able to set it back.
But now I am unable to recover it by HA again.

In Tasmota you make a cycle: SO19 0 and SO19 1... And the renewed device will be shown up in HA.

Can somebody help me, how should I solve this issue?
Thank you
AI: Could you please share your current MQTT configuration for the device (the exact topic and whether the discovery messages are set as retained)?
Command topic: cmnd/NH_Bojler/[Command]
Publish data topic: NH_Bojler/[Channel]/get
Receive data topic: NH_Bojler/[Channel]/set
AI: Have you already tried restarting Home Assistant, the device itself, or your MQTT broker, and have you checked if there are any retained discovery messages left from the old configuration?
I have restarted both, (the broker is inside the HA...)
As I mentioned, there is no problem - most likely - at all, I just removed manually the autodiscovered OB device and it does not autodiscover again...

It should work every time, just remove device, and do Discovery again:


If it is NOT working, then it's possible that you have entered a non-supported character in the device short or long name. Can you make a screenshot of those names, so I can check on my side?

You can also check in HA itself - do a "listen" test on homeassistant topic and watch for discovery messages from OBK. I guess they are broadcasted, but dropped by HA due to the malformed name...

Yes! That is the driving from habit...
I did not pay attention to the hint that only alphanumeric, hyphen and underscore are allowed.
Thank you for helping!