FOUND :)
these “urn” are no more used in the new authentication model for CRM Online. Here is the new values you have to use:
Old value New value
crm:dynamics.com crmna:dynamics.com
crm4:dynamics.com crmemea:dynamics.com
crm5:dynamics.com crmapac:dynamics.com
Reference:
http://mscrmtools.blogspot.pt/2012/08/php-to-crm-online-easy-way-to-do.html