Once again cisco is using old libraries for keyboard shortcuts and there is a problem with the letter ć from the Polish alphabet
In order to write it you need to use AltGr+c
Unfortunately cisco does not distinguish between AltGr+c and Alt+ctld+c for them in old libraries is the same.
The same in webex meating there is no solution for Poland and Spain shortcuts are supposed to work in the USA
Whem CISCO go to XXI century and allow user to create own keyboard shorcut in Cisco-app