Powering lora v2 by 3.3V not working


I have a circuit with a 3.3V regulator in it. Other esp32 boards work fine, but for whatever reason I cannot power my Lora v2 from 3.3v. What I am doing wrong? it happens no matter which of the two 3.3 pins i am using. It doesnt even work from a lab power supply, so does not depend on my regulator circiut.

Can heltec lora v2 boards run from 3.3V at all?

Help is much appreciated.

Electrical characteristics condition Minimum Typical Maximum
Power Supply USB powered(≥500mA) 4.7V 5V 6V
Lithium powered(≥250mA) 3.3V 3.7V 4.2V
3.3V(pin)powered(≥150mA) 2.7V 3.3V 3.5V
5V(pin)powered(≥500mA) 4.7V 5V 6V

According to this I should be fine. The regulator is deliverung smooth 3.3. To add: a “Lora Stick” runs smooth in the circuit, but both LORA V2 don’t accept voltage at their 3.3 pin :frowning: