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Solved it myself 🙂 I first had to upgrade to Duet Web Control 3.4.0-b2, after that, I could install the 3.4b2
Ok, thanks. Weird thing is, they just showed up. But fount it in SuperSlicer:
Print Settings > Output options > Output File > Label Objects. When off, it doesn't make the M486 anymore.
Thnx for all help!