SSRD variable not present even if selected in dowload request

Hello,
I am trying to download for the reanalysis product hourly data using the web interface for u10, v10, t2m and ssrd.
When I open the grib data in xarray however I only see

Data variables:
    u10         (time, latitude, longitude) float32 6MB ...
    v10         (time, latitude, longitude) float32 6MB ...
    t2m         (time, latitude, longitude) float32 6MB ...

the ssrd seems disappeared… I have tried also to download just for a day…
if I selectin the web form variable alone and download just that then it appears if I open with xarray.
Any idea what I am doing wrong or where the issue lays?

Many thanks in advance