score:3
In theory, within the Schengen Area, there are no internal passport/visa checks (though there may be ID checks for security reasons), but you are supposed to be able to prove your status at any time.
In practice:
So itβs probably not a good idea to travel without the proper documents.
Upvote:2
The previous comments and answers failed to notice that this is not a regular transfer. This is a kiwi.com unprotected self-transfer, where tickets are booked seperately and not through a carrier or a carrier alliance. In this case it may be required to exit to landside at an airport without flight transfer facilities and go through security again.
Kiwi.com informed you on the warning that Eindhoven airport probably will require you to go through security again, so make sure you have all the correct documents or book a regular connecting flight to avoid any mishaps. I have seen people have to prove their visa status while boarding an intra-schengen flight before, so I would be really cautious.