Hello ,
-I ve created a blueprint and assign external profile in blueprint.When I create windows machine it shows on portal IT is allocated but in machine its was not assigned .What could be the problem ?
Can you check Log if you are getting any message there or share log here.
2-I assigned custom property to ask machine hostname when user request .But its not assign same Hostname internally in windows machine just assign externally (vCenter.)
Are you using VMware Guest Customization Specification?
Below link for your reference to create Guest Customization Specification.
How to Create VMware Guest Customization Specification
Regards,
Randhir