When you go into this menu, are you on Wi-Fi or Telco network? I tried mine and got Volte unavailable when on Wi-Fi. When I disabled Wi-Fi, volte is available.Pressing #* doesn't result in anything for me.
I'd also tried dialing *#*#86583#*#* , but that also didn't change anything for me.
Are you sure that you're able to call without the 4G Voice app? I'm able to use data but unable to call.
If you're able to call, then can you show what you see when you press *#*#4636#*#* ? It shows whether VoLTE is working or not, for me it shows disabled. Posting a screenshot of the same:
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