Incent is a Waves token, so your Incent address is your Waves address.
It may be an issue with OpenLedger - try support for that?
Thanks, that is what I thought too. Will try that.
Actually it says "Please enter a valid INCNT address" (in red), I suppose this message comes up always just to make sure you get it right. So I was probably mistaken, when thinking my address is wrong.