It may not have been very clear, but you are the first to test vacuum cleaners via Matter in Gladys.
It’s possible that none of the features exposed by the vacuum are currently handled by Gladys, which would explain the behavior you’re seeing.
Could you click on « Download Matter Nodes as JSON » on the settings page and send us that file? (You’ll need to put it on a pastebin; the forum won’t accept a file that large)