Do you have a prepaid or postpaid account? Have you enabled the feature on your line through your MyVerizon account online?
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Let's ensure it's set up properly. Have you confirmed with customer service the feature is active on your VZW account?
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Hello. If I can add to this exact issue, I too have been unable to get WiFi Calling to work on my HTC 10.
I have ensured that the feature is active on my account, have HD voice enabled, cleared the cache partition to see if maybe something was glitchy since the last update, but to no dice.
When clicking to select/enable WiFi calling it just gets stuck in the loading screen asking to please wait.
Absolutely everything else on the phone works perfectly, so factory reset is not worth it .