Hey Cortona/Search Button Not Responding under Lockscreen (Non-Trivial, SOLVED)

goodsit2

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Note: Before someone mentions the check box under the speech settings, trust me I've tried many combinations with it on and off.

Just got a Lumia Icon off eBay, and everything seemed to be working appropriately except for Cortona/Search under lockscreen. Neither 'Hey Cortona' or holding the search button down prompt the phone to make any action while under lockscreen. I imagine the issues are caused by the same problem. Holding search button/'Hey Cortona' do work during normal phone usage.

Directly after receiving the product, I used the Windows Device Recovery Tool to install the newest OS/firmware possible (OS: 8.10.14219.341; Firmware: 02540.00019.15024.38022). I then used the restore function (backup of a Lumia 928) to get texts/calls/settings.

Since noticing the problem I've tried the following to no avail:
1. Resetting the phone/using backup of Lumia Icon (backup is from first prep of phone) on multiple occasions
2. Resetting Cortona on and off.
3. Toggling speech setting: "Allow speech above lock" (Both region and language are set to English/US)
4. Ensuring 'Hey Cortona' exists in notifications+action settings and banner is set to on
5. On all attempts, battery is > 20% and Cortona is set to always allow run in background.
6. Resetting the navigation bar

Potential issues I have noticed:
1. Search does not exists in notifications+action settings, hence unknown banner setting.
2. Unsure if this is a proximity sensor issue.

If anyone has an idea, I would greatly appreciate all the help I can get. I'm seriously at a loss, but don't want to give up just yet (would mean returning the phone).
 
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goodsit2

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Re: Hey Cortona/Search Button Not Responding under Lockscreen (Non-Trivial)

Used the Windows Device Recovery Tool again. Tried to see what happens if I choose clean slate, and had same issue. This seems undoubtedly a software issue, but I can't find the trigger which causes this issue. Microsoft Answer Desk didn't provide any extra insight to the issue either.
 

goodsit2

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Re: Hey Cortona/Search Button Not Responding under Lockscreen (Non-Trivial)

Wow. Despite hitting don't backup my phone for the clean slate. It erased my backup copy of the previous state. Woe is me.
 

goodsit2

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Re: Hey Cortona/Search Button Not Responding under Lockscreen (Non-Trivial)

New development... Search button while under lockscreen and on a phone call works. After a phone call, still does not work.

Update: As a new phone call was ending, I continuously hit/held the search button and it started working?! I mean what is this?? ha
I'm so confused..... but elated.
 

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