Hi @Mattches,
thanks for your reply. Sadly I can not confirm your solution. I already deactivated brave shield for this site completly. But to make sure thats no bug, I activated brave shields and allow the device recognition. No change - still got that problem.
Maybe one of you guys also got an dazn.com account to proof it - or just use the 30 day trail.
Meanwhile I tested it with youtube and other streaming plattforms - they all provide a correct fullscreen, so I think that dazn is using some kind of special streaming service?!
Have a nice day.