Prior to upgrading to macOS Big Sur, please ensure you have the most recent version of enterprise apps that you use, like Citrix Workspace, Cisco VPN or Microsoft Office. The latest version of these applications are available in PEAS Self Service. Also verify the compatibility of any non-enterprise apps you use prior to upgrading. 32-bit applications are no longer supported on macOS Catalina or macOS Big Sur.
Detailed information can be found in this announcement.