[Answer]-Django-allauth connect with facebook

You probably has set the auth_type param to ‘reauthenticate’ that makes facebook to asks the person to re-authenticate unconditionally.
Try to remove this param from your SOCIALACCOUNT_PROVIDERS setting:

SOCIALACCOUNT_PROVIDERS = {
    'facebook': {
        'SCOPE': ['email',],
        'AUTH_PARAMS': {}, # Leave this empty
        'METHOD': 'oauth2'
    }
}

Hope this helps you.