Tony,
The flight deck to cabin PA must be serviceable for flight.
All normal and emergency PA's (ie evacuation, alerts, stand downs etc) are given via this medium.
There is dispatch relief for some interphone functions, but not the PA.
There is also the possibility that the crew were training (and busy). A PA has fairly low priority in such circumstances. Not to say that it is flippantly dismissed, just that the crew will do one, workload permitting. On your flight it might not have been possible.
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