I just upgraded my iPhone 6s to 10.3.3 and after the reboot, there were "several more steps" to complete. I successfully entered my Apple ID and password. Now the screen displays:
Approve This iPhone
Go to one of your other devices signed in to iCloud to approve this iPhone... Waiting for approval.
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I am signed in to iCloud on my computer, but I can not find any option to approve my iPhone. My iPhone is listed under devices, but the only option is to "Remove" it. My phone is not receiving text messages for the dual verification. Thankfully it can still receive a phone call for the verification code.
Help!!