Yes I have and I got almost the same response as from you now. They told me to use IP control and evaded the question about getting access to telnet. Is there anything obviously wrong in terms on how I use PacketSender (screenshot)? For some reason I just can't get it to do anything, but as far as I can tell I get a reply back.
The link you posted show me "You are not awaiting validation for a lost password request".
I'm using Home Assistant which supports Telnet, but it seems to be more work to use IP control.
Again, I just don't understand why Telnet should be enabled, but locked down with a ID/password.