Please check whether you have allowed your device to use the camera. You can change this in the settings of your device. If you are using a company device, this problem may be due to the settings installed by your IT department. Please contact this department/the person in charge or use a different device. As an alternative, you can also perform the test without verification of identity. Please remember, however, that in this case you will not receive a medical report or a Green Pass/EU Digital Covid Certificate.