Hi
What OS version are you using, my screen shot shows:
Have you tried starting in safe mode ?
https://support.fairphone.com/hc/en-us/articles/360048843571
Further you may be able to use ADB to enable the camera.
If you are not familiar with ADB you can search this forum
This is a link to my use of ADB on a Raspebrry Pi to remove some apps.
Similar problem here:
Detailed ADB commands and set up
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