You can let users automatically accept chat invitations from other people in your organization. Otherwise, users have to manually accept invitations from new contacts by default.
- 
    Sign in with a super administrator account to the Google Admin console.If you aren’t using a super administrator account, you can’t complete these steps. 
- 
    Go to MenuApps > Google Workspace > Google Chat. Requires having the Service Settings administrator privilege. 
- Click Chat Invitations.
- (Optional) Under Organizational Units, select the organizational unit you want to apply settings to. By default, the setting applies to your entire organization.
- Select On or Off.
- Click Save.