Just curious which WorkSpaces OS do you see this issues? Do you know if this issue appears after a reboot of the WorkSpace as well or does it happen only on log on/off? There's a couple of things you can check/try:
Check to see if the WorkSpace computer object in Active Directory located in an OU where the group policy is applied? If it's not, there's a possibility that the settings got reset after the reboot.
The work around described in the documentation suggests GPO configuration, however you can manually try to delete the registry key
Note: I would recommend doing this on one specific workspace to test and doing so in a test environment if possible.
- Set the time zone using the UI or run "tzutil /s "Central Standard Time" in the CMD
Note: If you could also try to set the timezone during user logon using a logon script.
- Then reconnect to the Workspace to test.
Last, you should opens an **AWS Premium Support **case to continue troubleshooting of the issue.
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