Hey!
how do i activate this availability Alerts down on thr screen?

As you can read in the text below the switch, you can't activate this "because Location Services are turned off in Settings".
How to turn it on: https://support.apple.com/en-us/HT207092
My location services are turned on.
@2x-pr0
Could you provide a screenshot from the "Location Services" Menu?
Are you using "Content & Privacy Restrictions" or any other device management/profile?
Please note that the Menu what you are seeing is maintained only by Apple and the developers from Corona-Warn App do not have any influence on it. So maybe it would be better if you go to the Apple Support and try to figure that out with them.
Ive got it fixed with https://discussions.apple.com/thread/251753922
Most helpful comment
Ive got it fixed with https://discussions.apple.com/thread/251753922