Have you made sure your buff does actual damage? if the amount is damage is set to 0 your units wont take damage from the buff.
Also make sure that the actually buff is there i the data editor, if not you can copy it from the data editor where the script originated from.
or open the first TTosh mission in the editor (you can find it in campaign), go to Data editor, and search for the word 'Lava' in the behaviours tab. then copy the buff called Lava Damage. Thats the way i did it ;)
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Have you made sure your buff does actual damage? if the amount is damage is set to 0 your units wont take damage from the buff. Also make sure that the actually buff is there i the data editor, if not you can copy it from the data editor where the script originated from. or open the first TTosh mission in the editor (you can find it in campaign), go to Data editor, and search for the word 'Lava' in the behaviours tab. then copy the buff called Lava Damage. Thats the way i did it ;)