Mikrotik support helped me in the end. You need to set debug as a prefix not as a topic:
if you do a print in system logging you should see similar to this:
# TOPICS ACTION PREFIX
caps disk debug
Let me know if it works afterwards. This needs to be done on Capsman
I have the same issue. I have some problems whit a few devices ad I would like to debug them. I have setup following config:
/system logging
set 0 disabled=yes
set 1 disabled=yes
set 2 disabled=yes
set 3 disabled=yes
add action=disk topics=info
add action=disk topics=error
add action=disk topics=critical
add action=disk topics=warning
add action=disk topics=wireless,debug
add action=disk topics=caps,debug