HP ML350 Gen 9 - Power Supply redundancy with x4 RPS enablement kit

Hi.

I got an ML350 Gen 9 with 3x 800 Watts PSU.

Per review on HP Power Advisor max power load is around  750 watts. 1x 800 Watts PSU should be able to power up the server.

I plug one PSU, the server wont power up

I plug two PSU, the server wont power up

I plug three PSU, the server powers up.

Shouldn't the server be able to function with just one PSU ?

Can I configure the 3x 800 Watts PSU in 2+1 Power Supply Redundancy?

I connected all PSUs and power on the server, but when I removed one PSU the entire server powers off.

Where can I get power supply redundancy settings for ML350 Gen 9 with x4 enablement kit.

Like 2+2, 2+1 or 2+0

Thanks,

Paul