BLF light not working

I’m assuming this must be a bad bulb issue. I have some buttons on two different Sangoma S505 phones that won’t light up when I assign them as a BLF. If I move that extension to a different button then it does light up as a BLF. The phones are only a few months old and are running firmware 1.64 (2.0.4.79). Am I missing something?

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