Okay, this is interesting.
I added another one, and it did not appear. Most likely because it runs on .org and is not migrated.
And then I added another one, which did appear. That one did never run on .org.
So the list of repositories on .com is filtered and does not give message why a certain repository is not shown.
@native-api this is what the screenshot Can't find a repository that I just added .travis.yml to - #3 by benkasminbullock reminded me. When I started with .com I was missing exactly like that repositories. The fix in the end may be different as I needed to migrate otherwise it won’t appear, but I also got quire some of my repositories in the list just missing some.