I've been doing OK in Google for some years now. As soon as a customer's site is ready to go live, I add a link from my portfolio to that site. The site is in Google in a couple days. Can work to improve rankings after that.
A recent customer complained this AM that her site isn't in Bing.
She's right, as far as I can tell.
We've got #23 or #25 (depending on ... something) in Google for the name of the site. Can't find it in Bing.
The principal is the same. The key to getting into bing is being spidered via a link. Does your portfolio site show up ok in Bing?
It may just take time. It would be worth checking the log files for the clients site to see if the site has yet been crawled. If it has been then it should show up. We dont yet have a time line worked out from initial crawl to becoming visible within the serps.