Issue in activating environment on UAT server

Question

I was working on a script that logs in to UAT server, reroute to necessary folder and activates the virtual environment.

Following is the script:

function gotouat(){
    branch=`getBranchName`;
    echo "Logging into uat for branch $branch";
    ssh -t uat "cd ../projects/$branch && source envproj/bin/activate; zsh";
}

This script reroutes to the necessary branch, but does not start virtual environment.

Following are the debug logs:

debug1: Sending command: cd ../projects/test-branch && source envproj/bin/activate; zsh

debug2: channel 1: request exec confirm 1

debug2: callback done

debug2: channel 1: open confirm rwindow 0 rmax 32768

debug2: channel_input_status_confirm: type 99 id 1

debug2: PTY allocation request accepted on channel 1

debug2: channel 1: rcvd adjust 2097152

debug2: channel_input_status_confirm: type 99 id 1

debug2: exec request accepted on channel 1

Any help would be appreciated! Also this is my first post, so apologize for any missing information/issues.

Thanks!