Ok, I had this same problem with it not finding the repository. I hadn't added or enabled any other repos. My install is fairly stock with a few additional add-ons. Poking around from clues of people saying to remove repos from /usr/local/etc/pkg/repos, I found that i had to copy the FreeBSD.conf.sample to FreeBSD.conf to make it live to disable the FreeBSD repo. This seems to work. My OPNSense has found the 21.1.4 update now and is in progress of updating. I had never done anything to specifically enable this FreeBSD repo that I know of. I had to go in specifically to disable it.
Again, not sure what caused it to break. Seemed to do it after 21.1 update, but I won't blame anyone. Just sharing my experience if it will help anyone else.
Again, not sure what caused it to break. Seemed to do it after 21.1 update, but I won't blame anyone. Just sharing my experience if it will help anyone else.