Error "Conversion failed" when you update to Configuration Manager version 1810

You create collections that have incremental updates enabled, and the schedule token is created by using PowerShell cmdlet New-CMSchedule together with the -DurationInterval and -DurationCount parameters.

For example, you use the following PowerShell commands to create the collection:

$Schedule = New-CMSchedule -DayOfMonth 1 -DurationInterval Days -DurationCount 31
New-CMDeviceCollection -Name "TEST-2" -LimitingCollectionName "All Systems" -RefreshSchedule $Schedule -RefreshType Continuous

The collection has the following flags and schedule token:

Flags = 4, Schedule = 2C996A0007D00008

When you update to Configuration Manager current branch version 1810, you receive an error message that resembles the following:

Note This issue doesn’t occur if you set the update schedule in the Configuration Manager console.

This issue occurs because the schedule token contains an invalid character (D in the example). Therefore, upgrade precheck fails.

To fix this issue, follow these steps:

1. Identify the collections that may cause this issue by running the following query:
   
   select CollectionID, CollectionName, Flags, Schedule from Collections_G
where (Flags & 0x07 = 0x1 or Flags & 0x07 = 0x04) AND 
Schedule <> '' AND Schedule is not NULL AND 
substring(ISNULL(Schedule, ''), 11, 1) not like '[0-9]'
2. Change the schedule token of these collections. For each collection: On the Membership Rules tab of the collection’s Properties dialog box, clear Use incremental updates for this collection or change the schedule for a full update on the collection.