Work email under iPhone’s settings> messages > send and receive

Why is my work address included as an account under my personal phone under settings>messages> send and receive? Does this mean my employer can see my personal text messages? How did work email get there? I did not put it there. Additional details: It is a Personal phone - Only installed is Microsoft one drive, teams, and outlook from employer. These were installed by me and logged into work email account on my personal device. Additionally, there is no other certificate or account or anything under VPN settings. Also, under certificates, there is no option under certificate trust setting for turning on. Only specifies trust store version and trust asset version. Did teams put my work address under iMessage send and receive option in settings? Can my employer see my personal texts?