The contact form is protected by hCaptcha to avoid spam. This is (relatively) easy to solve by a human and really difficult for a computer/machine. Fill out the form and click “Submit”. Do not forget to click “Submit”, after solving the captcha-challenge and you’ll receive a confirmation when the message has been sent.
WARNING: In other words: After you click the “Submit”-button you have to solve the hCaptcha and after that you are approved and have to click the “Submit”-button a second time. After clicking the button (the second time), wait for the confirmation which says: “Thanks! Your message has been sent” – if you don’t see this confirmation, your message has not been sent – please read this carefully if you have problems!