Recently, I had an issue after swapping out a users phone on their desk and when they came back after a short holiday they couldn't login and received the following error:
"Login failed due to a configuration error. Please ask your system administrator to associate your phone with the RM JTAPI Provider user ID according to the instructions in the administrators guide"
Now I was searching UCCX for a while and still couldn't figure it out - after googling the solution was clear so I thought I would share it with the Cisco community after they have helped me so much
if you intend to do add/replace new phones onto an IPCC/UCCX platform you need to carry out the following steps:
Get the MAC address of said phone, login to CUCM then user management -> Application user -> then pick your RMCM user and add the device MAC that way and associate it with the pool – obviously if you remove a phone or swap it out remove the MAC from that pool also.
Thanks and hopefully this can help someone in the future.