if you’re not community banned you might still be instance banned on the community instance, which wouldn’t show up in your local instances modlog if the ban happened on a <0.19.4 instance. if the methods pointed out by other comments here fail I suggest you visit the instance of the community and check the site modlog there, searching for your user.
i suspect you’re referring to your post to a lemmy.ml community and you have indeed been instance banned there for a limited amount of time.
that’s odd, my (indirect, reported by others) experience with GlobalProtect on Linux was mostly fine, although when using SAML it only really works with the GUI version and not the CLI version