Deleted Tasmota Device, cant bring back anymore

Hello guys, i have a problem with a Tasmota Device. I had a smart plug with Tasmota v9.1.0 in the Tasmota integrity settings. So far, so good. But I noticed that a few entities, i.e., values, were missing. I also didn’t like the name. I then deleted the device from Tasmota and thought I could re-integrate it. But now it doesn’t appear at all. It’s not being discovered, and it’s not showing up in the MQTT integrity settings either. I’ve already reset the smart plug and configured everything from scratch. I set SetOption19 to 0. I restarted HA, nothing happens. But it’s no longer showing up as a device. In the Misquitto log, I can see that it connects successfully. So the connection to HA is established. What can I do now? Why isn’t it showing up anywhere anymore?

Greet’s
D3ltoro