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I would use the Modbus scanner as the reference and configure only one tag first, for example L1-N Voltage. Match exactly the function code 04, start address 0, length 2 registers, 32-bit float format, and word order. Once one value is correct, copy the same logic to the other meter parameters.

Most likely it is locked, not in the correct edit mode, or the drive is not in a condition that allows parameter changes. Start with write protection, stop status, and keypad setting mode.

Yes, it should work for a bench test. I would still check the transmitter datasheet first, especially the allowed supply voltage, minimum load requirement, and terminal wiring.