Wow, that's super weird. Removed and readded the repository and it showed up under integrations immediately (I did this before opening the issue). Added clientid/secret and sensors are there and working. Computers are weird, will close this one out.
I have exact the same issue. I also did the same "steps" you did, only unfortunately for me the Strava integration doesn't show up.
Originally posted by @Fleshi1981 in #21 (comment)