ROG Phone 3 Camera showing error " Camera is being used by another application. Please close that ap

[ChocoHunter69]

Please tell us some basic information before asking for help:
Model Name: ROG Phone 3
Firmware Version: 17.0823.2012.122
Rooted or not: not
Frequency of Occurrence: first time
APP Name & APP Version (If your issue relates to the app): Camera - 7.4.16.0_201203
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[Gustav_ASUS]

@ChocoHunter69 Does this occur all the time and directly after rebooting the device? If a simple reboot does not solve your issue, try booting in safe mode and see if it persists. That way, we'll know if you have a third-party application messing with the camera.
Hold the power button -> Long-press "Power off" until it asks you to reboot to safe mode