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Your Duct(s) should be reporting an Air Flow if connected to one or more Air Terminals. The specific Air Flow is determined by the Air Terminals, and if your Duct Tag is reading 0 for Air Flow, then it is likely not properly connected to the Air Terminal(s). See image below.
If your Duct Tag is reporting "Not Computed", then the calculation have been disabled and can be re-enabled by going to Project Browser » Families » Duct Systems » Duct System and going to the Type Properties of that Duct System. There, you will find the calculation settings.
Corey D. 
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⁞|⁞ Please use
.Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!
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