Windows 10 Feature updates disabled camera access and some of the apps have lost the default access ... else you will need to download an older version and install it. Most available USB webcams ...
and use the toggle for Allow multiple apps to use camera at the same time option. Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP (2006-16) & a Windows Insider MVP (2016 ...