No PSN+ Membership benefits?

So the master ( Primary ) account has a Playstation Plus membership with 11 months left to go before expiration.

Why isn't my local profile on the same Playstation 4 system getting any multiplayer benefits if no settings have been changed? I've been playing for 2 weeks and suddenly it doesn't work.

Any help would be lovely.


For any secondary (i.e. non PS+) accounts to benefit, the PS+ account must of set this system as the primary system.

This is achieved via the instructions on the playstation site