Data not working? SMS notifications not received

Mobile data doesn't work. I received this original welcome to Fizz SMS, but no other SMS received. How do I get the two notifications mentioned below resent to me?
I also tried setting the APN manually that did not work either.
Welcome to Fizz!
The network parameters may need to be configured. You’ll receive two notifications on your phone: make sure to install them. If a PIN is required, enter 1234. If you miss them, click here:


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