Camera does not work on PoE but is fine via adapter

Please help a newb out.

I purchased a PoE camera and injector from Amazon. The camera does not power up when connected to the injector.

The injector is a 4 port unsolicited PoE switch

Instructions were typical Engrish but I have the camera up and running via the external power adapter. I'd just like to learn what I did wrong. (besides not having my wife/professional do it)

This is the only camera I have thus far but I am looking to add more soon.

External adapter outputs 10V 1A which is within the range of the injector.

Camera on Amazon

POE IP CAMERA: This is a Power Over Ethernet (POE) camera and requires a separate POE Injector(not included) or POE Switch(not included) to operate. The Advanced PoE Technology enables you to use a Single Network Cable for both Video and Power Transmission, then making the Wiring Simplified and Installtion Easier. We also provided an extral adapter for power supply replacement if you don't use the POE Function.

1920*1080 HD: Superior Full HD 2 Megapixel Video Resolution, 3.6MM fixed lens, and advanced 3D dynamic noise reduction technology, offer you Seamlessly Stream Video and really Clear and True images As Most of Our Reviewers Stated Below.
NIGHT VISION: 6 Pcs Big IR LED lights offer you with 20M night vision distance, please don't worry about dark night.

WEATHERPROOF: We have used with IP66 Level waterproof steady aluminum case and also extral protection to ensure our cameras will be durable enough for using outdoor even under rain, snow etc bad weather.

Record and Playback using our free APP, ONVIF NVR or BLUE IRIS. Remote viewed by Iphone/Andriod Phone, pad and Windows PC anywhere anytime.

4 port PoE Injector

5 x 10/100Mbps Auto-negotiation Fast Ethernet RJ-45 ports with 4-Ports PoE function
Midspan Mode-B Unsolicited Power(4,5+/7,8-)
Supports PoE power up to 96W for all PoE ports, Per port Max 48V 1A or 50Watt
Supports PoE IEEE802.3af/at compliant Powered Device (PD)
Each port supports auto MDI/MDIX, so there is no need to use cross-over cables. Full/half duplex transfer mode for each port. Wall Mount.