Espruino Pico: ERROR: Pin B7 is not capable of USART RX Suitable pins are: A3

Hello all,

I tried to use the Pins B6 and B7 of the Pico for USART like shown in the reference picture. I get the following error message:

ERROR: Pin B7 is not capable of USART RX Suitable pins are: A3

What is wrong here?

The code line is the following:

Serial2.setup(115200, { rx: B7, tx : B6 });

Best,

Tobias