Just found this issue. We have the same problem. There is a small discussion on that going on here as well: The new Climate Data Store Beta (CDS-Beta) is now live! - Announcements / C3S - Announcements - Forum (ecmwf.int)
No official reply until now though.
Here’s the original message:
Hi all,
I have a similar issue. I am trying to download ERA5 Land data. When I submit the request via the GUI it starts processing directly. If I send the exact same request via python cdsapi it is queued for an hour or so. I checked the status and it goes into the MARS Archive queue of 190 parallel requests.
“The maximum number of requests that access the CDS-MARS archive is 190”
I think that if the requested dataset is not in the MARS Archive via GUI request, it cannot be in the MARS Archive for python API requests.
Might it be that API requests are treated differently than using the GUI?