NT SERVICE\BrokerAgent has lost the right to Change the system time. This is likely due to a Group Policy change, listing specific identities that are provided this right but excluding BrokerAgent. The Group Policy will need to be updated to include BrokerAgent in order to resolve the issue.
This permission is located in Computer Configuration > Windows settings > security settings > Local policies > User Rights Assignment [ Change the system time ]
This permission is added during installation of the Citrix VDA and is required to support Time Zone Control policy settings.
https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/policies/reference/ica-policy-settings/time-zone-control-policy-settings.html
In this scenario, Time Zone Redirection has been configured and enabled but fails to apply to the session VDA. AOT traces may show messages similar to the following:
Return Code 1314 is "A required privilege is not held by the client."