As found when looking at
CONTRIB-5870, the lang string emailmessageurlalreadyexists is in local_hub rather than core. Most likely other strings used in the registration process are also in local_hub. One consequence of this is that strings are not translated. Local: Hub is a plugin which is no longer maintained and is seeking a maintainer.
- has a non-specific relationship to
CONTRIB-5870 Scary message confusing users of Moodlecloud sites when registering
- has been marked as being related by
MDLSITE-4141 Unable to register subdomains because of "Site already registered" message