EXTRACT:
Borosilicate glass is very robust and heat-resistant. It can also withstand temperature fluctuations, such as when pouring hot liquids, without fear of deformation. Because of this, it can also be used for cooking and baking on the cooker, in the oven and in the microwave. For example, it is suitable as a material for kettles, baking dishes, oven trays and even pans.

SOURCE:
https://plastikfreiheit.de/5-fakten-u...

MY OPINION:
So the sieve and lid would certainly have to be removed (I'm assuming).

Why the question:
Haven't found anything at the manufacturer. Just thought someone had already tried it.
I don't have a kettle myself and it's still practical in the microwave.
The question is whether the handle gets hot or conducts heat.
I have both with cups, one that doesn't get hot and the other so hot that you can't hold the cup by the handle.
Otherwise, I'll ask the manufacturer.

Thanks to the community! :)

I can't say, I don't have a microwave.