https://send.firefox.com/download/69e3e4861cb09fa8/#-w6IT4BmUMD8cT0g9PgVeg
Server responds with Registration error: not _acceptable
Registration error: not _acceptable
Issue was cause by the lack of support for fill-out registration form using DataForm.
New version deployed.
https://send.firefox.com/download/69e3e4861cb09fa8/#-w6IT4BmUMD8cT0g9PgVeg
Server responds with
Registration error: not _acceptable