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In order to receive calls to your TextNow account on your iPad, you will have to ensure that you are logged into the correct TextNow account when the call is made. You will also want to ensure that your device is successfully connected to a reliable wifi network.
If you're still having trouble, it is possible that you still need to enable the notifications permissions for the TextNow application in the Settings of the iPad itself.
For additional assistance you can reach out to one of our chat agents - found on the bottom right of this page!