12

If I have one of the Karn planeswalkers in play as my only legendary permanent can I then tap my Mox Amber for a colourless mana?

23

No.

Colorless is not a color; Mox Amber can never produce colorless because it says it produces "any color [...]".

105.4. If a player is asked to choose a color, they must choose one of the five colors. “Multicolored” is not a color. Neither is “colorless.”

7

Colorless is not a color

No, you cannot tap a Mox Amber for colorless mana. Mox Amber says

{T}: Add one mana of any color among legendary creatures and planeswalkers you control.

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