Microsoft.RecoveryServices vaults/backupPolicies scheduleRuntimes string[] format

The syntax of the string[] scheduleRunTimes for V2 policies has to be documented in some way. It should be ISO 8601 extended format with milliseconds instead of ISO 8601 extended format without milliseconds. The only place this is visible is by reverse engineering an ARM-template.

Format: ISO 8601 extended format with milliseconds.
Structure: 'yyyy-MM-ddTHH:mm:ss.SSSZ'

Format: ISO 8601 extended format without milliseconds.
Structure: 'yyyy-MM-ddTHH:mm:ssZ'

The documentation at https://learn.microsoft.com/en-us/azure/templates/microsoft.recoveryservices/vaults/backuppolicies?pivots=deployment-language-bicep#dailyschedule does not suggest anything other than strings.

The linter does not show any error.

The error you get upon the deployment is:
Status Message: Input for create or update policy is not in proper format. Please check format of parameters like schedule time, schedule days, retention time and retention days (Code:BMSUserErrorInvalidPolicyInput)

Quickstart-template is without milliseconds
https://github.com/Azure/azure-quickstart-templates/blob/master/quickstarts/microsoft.recoveryservices/recovery-services-daily-backup-policy-create/azuredeploy.parameters.json

At runtime the format is always: ISO 8601 extended format without milliseconds.

I'll provide some code for recreational purpose tomorrow.

Start with the DailySchedule documentation page and compare its scheduleRunTimes description with quickstarts/microsoft.recoveryservices/recovery-services-daily-backup-policy-create/azuredeploy.parameters.json. Resolve the conflicting milliseconds formats from the deployment behavior, then document the authoritative format so the schema guidance and quickstart agree.