Photon with Powershield and Normally Open Reed Switch setting not working

Troubleshooting
1

I’m new to programming and electrical components, so please forgive any errors in the description:

I have a Photon attached to a Powershield. A 3.7v lipo battery powers the Powershield. I’m using a modified You’ve-Got-Mail hackster code from https://www.hackster.io/macsboost/you-ve-got-mail. (It is modified to remove the thingspeak and Lipo chargeboard references because I’m using a Powershield.)
I’ve wired it according to the schematic on hackster.

When using just the Photon, it alerts when the magnet moves away from the reed switch alerts (Good!).
But with a photon + Powershield, the magnet only alerts when the magnet nears the reed switch (Not good!).

Also FWIW I had switch-related power problems with the Powershield when connected to the 3v3, probably because of how the Photon gets power when connected to the Powershield. So, I wired the switch and resistor up to the 5v power pin.

I’d like the change my wiring or code so that when I withdraw the magnet, I get the alert. What can I do to make this happen?

Edit to include that my purpose in this project is to monitor beehives; to give me some warning when an apiary is getting knocked over, stolen, etc. (Bears or mischief-makers).

2

AFAIK the Particle Power Shield does not sport a boost converter so there won’t be 5V on Vin.
And 3v3 should do fine anyway.

That “text-art” wiring diagram isn’t too clear, so when you say you are new to “electrical components” can draw up a schematic how you have got your setup and post that here?

3

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It's like this, but the reed switch is connected to the Photon D0 not D2. (And to the Photon's VIN instead of 3v3 as shown in the ascii sketch).

4

The pull-resistor needs to be pulled to the opposite level of the switch in order to detect the difference between the two levels.
And as said, with a LiPo there is no 5V on the Vin pin but rather something between 3.5V and 4.2V.