Unable to launch ICA session on multiple delivery groups simultaneously while using FsLogix ODFC (Office Data Containers) Container.

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Misconfiguration related to FsLogix ODFC containers.

Concurrent and Multiple connections require specific configuration for the ODFC container.

Please apply the following FSLogix registry settings to the VDAs across all relevant Delivery Groups to resolve the issue. These registry settings enable the ODFC container, providing the ability to have multiple VHDX files. The combination of the below settings allows FSLogix to write across different server sessions.

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\FSLogix\ODFC]

"Enabled"=dword:00000001 (Enables the FSLogix ODFC container feature)

"VHDAccessMode"=dword:00000003 (This allows using Concurrent\Multiple Connections)

"NumSessionVHDsToKeep"=dword:00000002 (This controls the number of VHD or VHDX files associated with a user's profile that are kept on the server after a user signs out)

"Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it."

This article describes the configuration required for FsLogix ODFC containers to support multi-concurrent connections.