You don't need to define any E1.31 for the channel test page to work. The only thing you need to do is create a channel output and then toggle testing on and that should turn lights on.
Can you go to the FPP Settings page and set your Log Level to Debug and make sure that at least the 'Channel Outputs' checkbox is checked for the Log Mask section, then restart fppd. Then go to the FPP File Manager and look at the tail end of the fppd.log file to see if there are any messages about the channel output. I'm running the latest stock v1.9 code on a Pi right now on an infinity mirror so I know the code should be working.