If I now test the plugin on my localhost (I use Woocommerce > Settings > Maximum Products per User > Per Product > enable and for one product I set the limit to 1), then it works wonderfully. If a customer will order the product with quantity >1 then i see the notice “You can only buy maximum…”. Perfect.
If I do the same on the online production website (same configuration), then customers can still buy the product with quantities > 1. It is as if the plugin Maximum Products per User not exist. Is it possible that I still have to do an activation or something?