invalid DN at /usr/share/webmin/web-lib-funcs.pl line 1478. when creating a new virtual server

Ive setup LDAP on a new install of virtualmin / webmin and am having issues adding a new virtual server after following all of the steps in https://www.virtualmin.com/documentation/installation/ldap

Here is an example of the errors in the "create virtual server" output

Creating aliases for administration user .. .. aliases failed : LDAP add of mailLocalAddress=demo@demo.com,dc=Virtual,dc=demo,dc=com failed : invalid DN at /usr/share/webmin/web-lib-funcs.pl line 1478.

Adding to email domains list .. .. Mail for domain failed! : LDAP add of mailLocalAddress=demo.com,dc=Virtual,dc=demo,dc=com failed : invalid DN at /usr/share/webmin/web-lib-funcs.pl line 1478.

Setting up spam filtering .. .. Spam filtering failed! : LDAP add of mailLocalAddress=spamtrap-demo.com,dc=Aliases,dc=demo,dc=com failed : invalid DN at /usr/share/webmin/web-lib-funcs.pl line 1478.

Everything else runs fine, re-check config for virtualmin finds no errors and the dc=Virtual,dc=demo,dc=com and Aliases,dc=demo,dc=com exist in the ldap database.

Help please ? Obviously ive replaced the real domain names and user with demo.com