I got the same creaking/clicking issues others have had after a few thousand kms and cleaning/regreasing only buys me an hour or two of silence before it comes back. Luckily Magene is already sending me a replacement of the entire power meter minus the left crank arm under warranty.
Also from my messaging of them, it sounds like Magene thinks the source of the noise is the interface between the crank arm and the spider, not the lockring which others have suggested.