I've noticed that Salesforce allows for sandboxes to be created with 2 letter names, and there is no validation to prevent a conflict with country code top-level domain names.
If someone were to create a sandbox named
qa, you might think that the system could have trouble distinguishing that suffix on a sandbox username from a second-level ccTLD.
firstname.lastname@example.org could be a production user with a Qatar domain username, or it could be a user of the
qa sandbox with a plain
I ask specifically because I think that an issue related to this might explain why I can't log into the sandbox I created this morning. I created a sandbox named
qa, and when logging into test.salesforce.com with username,
email@example.com (firstname.lastname@example.org is my production username (except with my actual name and company name))
I got the following error message everytime I tried logging in throughout the day:
(Username, password, or security token is invalid; or user has been locked out)
I have had no trouble logging into my other sandboxes.