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You need AnyConnect 4.9 MR4 or above for macOS 11 and above. Older AnyConnect releases leverages Kernel Extension framework which is now deprecated by Apple. AnyConnect 4.9 MR4 and above leverages System Extension framework. Please refer to AnyConnec...
This is most likely a compatibility issue between AnyConnect image and HostScan package on the headend. Take a look at the following table from the AnyConnect release notes. You need at least HostScan 4.10.02086 configured on the headend if you have...