Mapping fields that do not exist on the LDAP server causes PHP notices

Setup a LDAP server and setup the LDAP authentication plugin. If you don't have LDAP server you can use docker. For instance: docker run -p 389:389 --name my-openldap-container --hostname ldap.example.org --env LDAP_REPLICATION=true  --detach osixia/openldap:1.2.0 docker run -p 6443:443 --name phpldapadmin-service --link my-openldap-container:ldap-host --env PHPLDAPADMIN_LDAP_HOSTS=ldap-host --detach osixia/phpldapadmin:0.7.1 With this two commands you already have a nice LDAP server and PHPLdapadmin to manage. You can go to https://localhost:6443/  in your browser login: cn=admin,dc=example,dc=org password: admin Now, you can create a new user into your LDAP. In Moodle you can setup LDAP settings in http://YOURMOODLESITE/admin/settings.php?section=authsettingldap host_url: ldap://localhost:389 ldap_version: 3 start_tls: no bind_dn: cn=admin,dc=example,dc=org bind_pw: admin contexts: dc=example,dc=org search_sub: yes For your LDAP settings ensure you have  incorrectly  mapped the email address by entering a value in ‘Data mapping (Email address)’ that doesn't exist on the LDAP server and set ‘Update external (Email address)’ to ‘On update’. Following the previous example you can do: field_map_email: emailwrong field_updateremote_email: On update Install  https://mailcatcher.me/  or edit your config.php and add this setting: $CFG->divertallemailsto = youremail; Log into your Moodle site as one of your LDAP users. Following the previous example, you have to create an account in your LDAP server. You can use  http://localhost:6443/  to create a new account. Change your email in the user profile screen. View your mailcatcher UI or your inbox (usually in SPAM) if you have added $CFG->divertallemailsto. Visit the link sent to your email. Confirm: There is not PHP notices.