Mozillians.org location data is based on mapbox geocoding API. Due to our technical debt this was never updated to the latest version and the version that we were using got deprecated. This rendered the mozillians.org registration process useless.
As a quick workaround we pushed this hotfix release to unblock the registration process (including some other stuff that were already ready in the pipeline):
7e229ac78edf0b975f95a8d8921ccb9fe717041d Upgrade Pillow to latest version.
567dc5055663ef189a748a1c202ec3c44400510e Temporarily disable geolocation in profiles.
154dcdf8cf4dcf6a11f9f43525a7c392c5f228b7 List 'date_joined' in users admin.
We are already planning for a more futureproof solution to handle mozillians.org location data with an improved UX flow that is not depending on mapbox or any other geocoding service.