When the Microsoft Project (MSP) Schedule is opened through the Clarity MSP Interface, all the durations show up with a question mark (?) at the end.
This is due to having one or both of the following MSP Settings checked:
It's recommended to have these fields unchecked, unless you are using estimated durations. See below for the steps to uncheck these options.
Link to Microsoft Forum topic on this issue: Summary tasks show question mark in duration