Blocked calls

My workplace requires us to use Teladoc before going to the doctor. I have used this successfully in the past by signing in through the Teladoc app and requesting a callback from a doctor. For the past week they've been trying to call and NOTHING is showing up on my phone - no phone call notification, no voicemails. When I go back in to the app it says they've attempted to call back three times and I "may need to disable anonymous call blocker to allow the doctor to reach you. To deactivate anonymous call blocker, dial *87 on your phone. " Can anyone help with this!!???  This is not the time for this to be happening!  My daughter has many health issues! 

*We got new iphone 11s in February.

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