call block not sending calls to voicemail

This was working fine on verizon, but I just switched to att. I have a new version of the same s7 I had on verizon. Call blocking is blocking the calls, but it’s not answering the calls and sending them to voicemail. Any idea why this is happening?

Hi, the way the Call Blocker works is identical to pressing a red button on your mobile device - as if you refuse the call.
What happens then very much depends on your operator and your device/services settings - it either redirects the call to the voice mail, or starts making the “busy line” tone.