How come I unable to install communication widget on site?

[Thomas-1]

before the latest or newest update happened this summer,  I had 4 different channels on my previous site (free plan) also I myself added code in emded codes in setting. now im confused since its different and support team never helped me since two months about that. im so frustrated because when I was on paid plans and free plan, theres only one facebook messenger which sucks for leads and marketing anyway. any one who has idea how to do or did I miss something?