Virtual sensor 'solar radiation' not vissible in Blockly

[RayAmsterdam]

Since WU stopped their API I made a time-triggered Python script that scrapes the weather values directly from the weather station's server and assigns them tot manually added virtual sensors.
I used to switch the lights with blockly from the value of (WU) solar radiation, wich worked flawlesly. Now however I am not able to select the newly added virtual sensor solar radiation in Blockly. It is not in the list.
What am I missing? Search didn't help me out.