Hello Rich and Welcome to the Do It Yourself Web Site and to the Gas Appliances topic.
Based on the description, I have to assume...

there are two separate burners? One for the oven and one for the broiler?
If that is correct, there will be two gas control valves. One for each burner. Not one gas control valve for both. Kindly correct me or clarify.
Also should be two glow igniter's and two burners? Or one burner & one igniter functioning for both oven and broiler?
Possible during the R&R (remove & replace) a connection at the wire terminals not making contact. Especially if the quick disconnect had to be removed and the wires twisted together.
Kindly elaborate more with details how the new igniter was installed. Help us help you.....
Within the sticky note
HERE there is a detailed explanation how to install a new igniter (HSI) without a quick disconnect pre-installed.
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