This problem can be solved by either disabling lockdown on the client or adding a registry key on the client for allowhotkey.
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Error number 2320
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Citrix online plug-in Configuration Manager: No value could be found for (AllowHotkey) that satisfies all lockdown requirements. The lockdown requirements in force may be conflicting.
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OK
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option 1 (disable lockdown)
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions
Enablelockdown change to 0
option 2 add reg key for AllowHotkey with empty value
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Client Engine\Hot Keys
“AllowHotkey”=””