You may be in a catch 22 condition.
My max2play Kodi installation had services->control->Allow remote control via HTTP turned off by default.
You will need to turn it on to use a Kodi remote controller app
If it is off, how can you turn it on with a remote controller app?
#use ssh to connect and login as pi
# create a back up of your guisettings.xml file
# i.e. „cp guisettings.xml guisettings.xml_orig“
# edit the guisettings.xml file to turn on the webserver
# do not change anything else!
change the line:
<setting id=“services.webserver“ default=“true“>false</setting>
you will need to restart Kodi to turn it on.