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TripleO iPXE on Virtualbox gets Exec Format Error

I've been attempting to try out TripleO in a test environment using Virtualbox, but I'm having trouble booting my overcloud nodes from iPXE for the introspection step on It seems like it's able to connect and grab the inspector.ipxe file, and then grabs the agent.kernel file, and then goes into an error loop with this message:

Could not select: Exec format error (

I've been searching on this issue for a long time trying to figure out if I did something wrong when generating the images on the undercloud, or if there's something special I need to do with Virtualbox to let it boot from those types of images, but so far I haven't had any luck in narrowing this down. Has anyone else run into this before?

Here's a screenshot of the iPXE screen when it errors out: