Couldn't check this number's payment status with Meta right now.
Avox couldn't ask Meta whether it can take payment for this number, so its status shows as Unknown. This usually means the number's connection isn't finished or its access needs renewing. It doesn't mean anything is wrong with your payments.
Open Connections and check the number is connected. Reconnect it if Avox asks.
On Billing, click Check again.
You can always see the real status in Meta Business Suite > Billing & payments.
Still stuck? Send AVX-3442 to hello@theavoxai.com along with what you were doing when it happened.