That is the correct preferred-chain value for the production server. You have chosen the staging server to test (thanks) but the chain name is different.
I believe you could use --preferred-chain "Fake LE Root X2"
for test server as noted here
Also, what version of certbot do you have? Some versions had a bug (not causing problem with staging but for after).
Do,
certbot --version
UPDATE: @salman I just realized the link which described the Fake LE Root was from 2020. I do not know if that will still work for staging server. Please let us know either way and about your certbot version.