Some new participants to DC failed to register with no clear feedback.
They received a mail like this:
InterSystems Account Registration
Hello, We detected a new registration with this email address. If this was you trying to reset your password, you can do that by clicking the 'Forgot Password?' link on the login page. If this wasn't you, please contact ISC Support. Thanks, InterSystems Support
Which is correct but quite misleading.
As far as I could investigate DC is using SingleSignOn of WRC.
IF "the new registrant is unknown to WRC" everything works fine
ELSEIF "he has used the mail address already used for access to WRC" (which is quite common)
THEN SSO expects the password for WRC access and NOT a new one.
But nobody tells him beforehand and not afterwards what was expected !
Solution #1 : tell participants to have the WRC password ready if using the same mail address
Solution #2: log in directly to SSO (of course again with the correct password or a fresh changed one)
and select Developer Community from Application Catalog then.
(of course again with the correct password or a fresh changed one)