When patching and updating the openSuSE 15.4 setup with Veyon comming from the
Education repository, a message is shown at the end:

Problem: nothing provides 'pkexec' needed by the to be installed
veyon-4.7.3-lp154.33.1.x86_64
 Solution 1: Following actions will be done:
  downgrade of veyon-4.7.3-lp154.33.1.x86_64 to veyon-4.7.0-bp154.1.52.x86_64
  install veyon-4.7.0-bp154.1.52.x86_64 from vendor openSUSE
    replacing veyon-4.7.3-lp154.33.1.x86_64 from vendor openSUSE-Education
 Solution 2: break veyon-4.7.3-lp154.33.1.x86_64 by ignoring some of its
dependencies

But "pkexec" is already present from the polkit-0.116-3.9.1.x86_64 package.

Veyon work without problem (or message when started from the command line).