Check with your system administrator that the system requirements are met.
Often, problems with the network configuration manifest themselves in such error conditions. Please check the article I keep having connection difficulties during a meeting.
Google Chrome or Chromium browsers do not currently offer specific screen-sharing settings.
If you want to share the screen in a meeting, Mozilla Firefox offers a popup window for this purpose. However, if you have selected "Do not allow" here, then this popup window will not appear the next time you try to share the screen. You will then have to adjust the settings manually:
Permissions for meetings.procall.de → delete this permission and ask again. Then refresh the page with F5 or "Refresh".
Example screenshot: Grant permissions for meetings.procall.de in the Mozilla Firefox browser
Operating system settings
Apple macOS from Catalina
Follow the instructions in the following documentation appropriate to the operating system to give permission to the appropriate browser: https://support.apple.com/en-us/guide/mac-help/mchld6aa7d23/mac
Windows operating systems currently do not offer specific settings for screen sharing.
If you have problems using ProCall Meetings despite the help listed here or in the documentation, you can contact our support team: Report problem – Feedback to the developer