Cannot forward unanswered calls to Google voicemail


    I am trying to use my Google Voicemail with my Galaxy S8. I do the **004* and it sets up the conditional call forwarding and when I check the forwarding in setting it sets up "busy" and "unreachable" but it will not set up unanswered. I  have tried to set up the unanswered forwarding in setting but I get the error "sim or network error has occurred". Is this something that can be fixed. I am a post paid customer and have been for years and Google Voicemail works except for unanswered calls which is what I need it to do the most. Any help would be great. Thanks

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