Clicking sound when braking on new bike with Magura brakes after servicing

I have a new (month old) Cube Stereo One44 Pro. It's been going really well except some creaking in the headset. Just took it to a service today to fix the creaking and that's fine now. However, when I brake with the front brakes now, it makes the clicking sound like in the video, maybe 60% of the time. At the service they told me it's ok, just the braking disc needs to get more riding and it will be ok, that the Magura disc moves itself or something and other did when they put the bike together again. I never had this issue before and I'm very new to mountain biking. What could it be? Is it ok to ride? Do I need to get it checked by someone else?
Thank you