If you are unable to get any schedules to run in Azure Windows Update Manager, there may be an issue with the patch orchestration option. According to the Azure Update Manager documentation, the patch orchestration property for Azure machines should be set to Customer Managed Schedules as it is a prerequisite for scheduled patching. If the patch orchestration option is set to AutomaticByOS/Windows automatic updates, you may be unable to change it to manual updates. In this case, you can change the patch orchestration option to Customer Managed Schedules (Preview) or AutomaticByPlatform and ByPassPlatformSafetyChecksOnUserSchedule and not associate a schedule/maintenance configuration to the machine. This setting ensures that no patching is performed on the machine until you change it explicitly.
Thank you for your reply. These VMs are all set to Customer Managed Schedules. I was able to initially run one schedule to one VM as a test successfully. I've since added five more VMs (all set to Customer Managed Schedules) to the Resources in the Maintenance Config and set a schedule. The schedule will not kick off?