Signature Message not working properly

Hello team, Signature message set in admin panel not sending by default in all agent sign, #User-Name# not taking user name dynamically, in admin settings > signature msg not updating. if i update again getting resetted. please fix, thanks

Any update?

Update ?

I just checked in our end, I see it's working fine. Here username is the agent name, not the subscriber name. Also I just checked by updating message in admin area and I found it's working fine. I would ask you to give a video explanation how the problem is actually happening to understand better and reproduce the issue in our end, so we can fix it quickly. Thanks