Trying to import line protocol but fails on influxdb2

1

I’m trying to understand the rules on importing data. What obvious thing am I missing?

This fails.
radio,ip=1.1.1.1 WHISP_SM_MIB_radioDbmVertical_0=-46.0 1749180600000000000

However this passes.
radio,ip=1.1.1.1 SM_MIB_radioDbmVertical_0=-46.0 1749180600000000000

And this passes.
radio,ip=1.1.1.1 WWWWW_SM_MIB_radioDbmVertical_0=-46.0 1749180600000000000