Why my voicemail is not working?

I have 2 lines with Voicemail activated; when I call from each of them to the other one, will supposedly send me to voicemail (I already did the setup of both voicemail) but instead, it says something like: your current plan does not have this option enabled, please modify it on the web portal.
Also, when someone outside Fizz calls me, it receives a message (when trying to enter to the voicemail) saying that, my number is not on service.

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