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Ah i just found out that wireless pcbs doesn't support the LM command, i was using it just fine on my Fairbanks (Ikki68 R1 Wired PCB) but it doesn't work on Iceland (Ikki68 R2 Wireless PCB) and my friend's Finalkey V65 Bluetooth PCB
The code LM(3,MOD_LALT) will momentarily switch to Layer 3 with LALT activated.   
With that in mind, here are two questions:

What key on Layer 0 is this LM(3,MOD_LALT) functionality mapped to?
On your Layer 3, what is the number 4 key mapped to?