"Sign-in Method" option unavailable after Gitlab 8.9 upgrade

It says E-Mail

It is configured via gitlab config

#####################
# GitLab Mattermost #
#####################
mattermost_external_url 'https://example.com'
mattermost['enable'] = true
mattermost['service_use_ssl'] = false
mattermost['service_enable_incoming_webhooks'] = true
mattermost['service_enable_commands'] = true
mattermost['service_enable_only_admin_integrations'] = false
mattermost['team_site_name'] = "Example Mattermost"
mattermost['team_enable_team_creation'] = false
mattermost['gitlab_enable'] = true
mattermost['gitlab_id'] = "alphanumeric_key"
mattermost['gitlab_secret'] = "alphanumeric_key"
mattermost['gitlab_auth_endpoint'] = "https://example.com/oauth/authorize"
mattermost['gitlab_token_endpoint'] = "https://example.com/oauth/token"
mattermost['gitlab_user_api_endpoint'] = "https://example.com/api/v3/user"
mattermost['email_enable_sign_up_with_email'] = false
mattermost['email_send_email_notifications'] = true
mattermost['email_smtp_username'] = "gitlab@example.com"
mattermost['email_smtp_password'] = "supersecurepassword"
mattermost['email_smtp_server'] = "smtp.mailprovider.com"
mattermost['email_smtp_port'] = "465"
mattermost['email_connection_security'] = 'TLS'
mattermost['email_feedback_name'] = "Something"
mattermost['email_feedback_email'] = "no-reply@examle.com"
mattermost['email_feedback_organization'] = "The Example Ltd."
mattermost['email_send_push_notifications'] = true
mattermost['email_push_notification_server'] = "http://push-test.mattermost.com"
mattermost['email_push_notification_contents'] = "generic"
)