Eric Abrahamsen <eric@ericabrahamsen.net> writes:

>> It returns nil so I guess it's not good?
>
> Yup, that would cause the problem. And you're sure that the group name
> you're testing is a valid one, right? What do you get for just:
>
> (gnus-group-find-parameter <group-name>)
>
> ?

Yes I think that the group name I'm using for my tests is a valid one. I
added a screenshot so you can see by yourself.

Evaluating:

(gnus-group-find-parameter "nnimap+home:INBOX")

returns:

((display . all) (expiry-wait . 2) (gnus-use-scoring nil)
(permanent-flags %Answered %Flagged %Draft %Deleted %Seen $Forwarded
$Junk $NotJunk $NotPhishing $Phishing Forwarded ...) (active 1 . 95605)
(uidvalidity . "2") (modseq . "7813361"))