This problem is similar to this ussue: https://glyptodon.org/jira/browse/GUAC-1520
Configuring an RDP connection from the guacamole web interface, I can not select Brazilian keyboard layout because it does not exist.
With unicode it works but lack several features like CTRL+C and CTRL+V support.
If I use xfreerdp or remmina from a debian or ubuntu, I can connect with the correct Brazilian keyboard layout and from a windows too, but if I connect from guacamole web interface, I can not put the correct Brazilian layout, because it does not exist.
I already found a working Brazilian keymap on https://glyptodon.org/jira/browse/GUAC-1541, I set it up on my local enviroment and it is working, just would like to have it included in a future realease, so everyone can benefit of this support.
Attached revised keymap for validation.