Can I use after market Tempered Glass screen protector with Otterbox Defender series on Galaxy S8?

I have searched for the answer to this question everywhere and no one seems to know!

I just got a Samsung Galaxy S8, and already have a tempered glass screen protector that I am ready to put on the device. I want an Otterbox Defender series case for my phone as well, but have read mixed reviews on whether or not the tempered glass screen protector "works" with the Otterbox Defender series for the S8 (Otterbox encourages you to buy an Otterbox Alpha Glass Series screen protector).

I don't want to have to buy the expensive Alpha Glass protector. Is a tempered glass screen protector compatible with the Otterbox Defender series case for Samsung Galaxy S8? If not, what is the reasoning for this?

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