Hi,
Conversion to radiance for Sentinel 2 L1C level does not work with the newest data format after the last modification of baseline data processing (data after 25-01-2022). After running the process (SNAP 8.0 main menu - Optical/Preprocessing/Reflectance to radiance) nothing can be done after pressing the Run button (the program is up to date).
I use tile S2A_MSIL1C_20220214T100121_N0400_R122_T33UXU_20220214T120736.
Best Regards,
Slawomir