On older smart meters (SMR 2 and 4) the P1 Meter isn't powered through the connector. In order to power up the P1 Meter you will need a USB adapter set. You can connect it through the USB-C port on the P1 meter.
With newer smart meters (SMR 5+) the P1 Meter works without an external power supply. Do you have a new smart meter and the P1 Meter still doesn't turn on? Please contact us.