You cannot just add new levels to the database and assume it will work somehow magically. That's not how programming works.
If you want to introduce new levels you have to add them to the code, that handles getting and setting variables from/to the database etc etc.
Since you already posted a few topics i saw that you use some kind of custom framework thing somewhat derived from the Altis Life Framework by Tonic. So I can only assume that this info is correct... I'll give you here a list of files you should take a look at, to find out how to add the new level 
https://github.com/AsYetUntitled/…estReceived.sqf
https://github.com/AsYetUntitled/…ueryRequest.sqf
just keep looking for things like coplevel and try to get a hold of what's happening there 
Best thing is if you find out how to do things yourself to learn from this, if we provide step-by-step solutions for everyone and every problem no one benefits from it on the long term
Without your modified files we cannot help you tho.
Keep in mind that the tutorial you sent is from 2015 (!) and is definitely anything but the best solution to this and should not be done this way
and the requestReceived on the client?
honestly from just looking at it for a moment I can't find any major mistakes. you should insert some debug statements and try to figure it out
As I said. Add debug code. something like diag_log str _this to dump all parameters to log etc
