Ok this answer doesn't explain how to get your tasks to schedule on a fixed UTC time but it might explain why you may need to look for a third party task scheduler. Windows task scheduler does not properly support summer time changes. SVR2012 didn't, SVR2016 didn't and SVR2019 definately doesn't. With SVR2016 you can set the 'run missed task option' to get around it, but SVR2019 doesn't work even if you set the option. With SVR2019 once BST change has occured, it seems all scheduled tasks for the next 24 hours are disabled and a reboot of windows is required to enable them immediately.
Barny
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