50203: Programmable Chat: Username reservedERROR: 50203error-50203 page anchorERROR Error - 50203error---50203 page anchor IP Messaging: Username reservedip-messaging-username-reserved page anchor Possible Causespossible-causes page anchor Specified Username is reserved for IP Messaging internal use. Possible Solutionspossible-solutions page anchor Choose different valid username and provide it in request.