Be Anywhere voicemail messages being recorded on my iPhone voicemail, NOT the app voicemail

When a call comes to my iPhone from my work's Comcast Business line and I cannot answer it, it registers in the app with an alert that a call came in (notification). However, when the caller leaves a message, it does not record the voicemail in the voicemail feature of the app. Instead, it leaves the message in my cell phone's voicemail. I do not want it to do this. In addition, by not having it left in the Comcast app, I do not get an email transcript to my work email to help me track follow-up needs. Could someone please tell me what setting I need to change to prevent this from happening? Thanks!