both networks run on Verizon so it *should* work
Put the SIM into a smartphone and enable WiFi calling on that device to get the "code" added to the account to see if it makes the option show up on the flip.
If that does not work, it's likely that that phone just does not "know" the settings for WiFi calling with this particular SIM card, and it's not uncommon for this to happen when taking an unlocked niche phone between providers.
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