By creating this post I answered this question.

And was able to create an account.

A mozilla support account must be separately registered by posting a question.

Same credentials as Firefox account can be registered but different username and or password can be registered instead.

Firefox account is not needed to register a mozilla support account.

Hopes this helps anyone trying to sign in to mozilla support with Firefox account credentials.

Victor

Mozilla.org is divided into several independent support sites. Each has its own user/password logins.

The Firefox account is currently only used for Firefox Sync.

This support forum and other Mozilla websites each use their own way to login.