Teamwork for Google Sheets will need access to your Google account
This will allow Teamwork for Google Sheets to :
See, edit, create, and delete all of your Google Drive files
See, edit, create, and delete all your Google Sheets spreadsheets
Display and run third-party web content in prompts and sidebars inside Google applications
Connect to an external service
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available