Missing WiFi calling option

I just got an S8 edge (Android 7.0) and cannot locate the wifi calling option. There is an icon for it at the top of the screen (where bluetooth and signal strength icons are), but pressing it to turn on wifi calling does nothing. I have looked in the phone app settings - as some forums have suggested, and also looked under Settings > Connections > More Connection Settings and there are no Wifi calling options listed. Interestingly, my husband has an identical phone, purchased last year that has the option. Any suggestions? Is there an update I should look for? My phone is a refurbished model

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