It looks like the burners are not lit. A orange light keeps appearing near the burners and occasionally I hear a click but no fire is transferring to the unit as far a I can tell. What can the issue be?

My furnace has started this issue of only igniting 1 of its 2 burners. When only 1 ignites, the furnace shuts it down, waits a few seconds, and then tries again. Eventually the 2nd burner ignites and the furnace actually blows warm air throughout the house. It's natural gas. It came with the house when we bought it around 10 years ago. We live in AR so not super cold temps. We use a Nest thermostat, but it's new within the past month and had a Honeywell digital unit prior. It did this on that unit as well. I've posted a 1 minute video of it in action on YouTube here https://youtu.be/_Aqfa_51VBc. Any ideas? TIA! James