Cannot create CodeCatalyst - Error at first try, then I always get "Alias unavailable"

Question

I created a CodeCatalyst account. When setting the alias, I first got an error "Alias could not be created". After that I always get the error "Alias unavailable" regardless of what I enter, even random characters do not work. In the browsers developer tool window I can see that calls to https://public.console.codecatalyst.aws/graphql receive the response below:

Updated to add: Could the reason be that the first error resulted in an incomplete alias creation that now prevents setting an alias

{
    "errors": [
        {
            "message": "conflict",
            "locations": [
                {
                    "line": 2,
                    "column": 3
                }
            ],
            "path": [
                "createUserDetails"
            ],
            "extensions": {
                "name": "ConflictException"
            },
            "name": "ConflictException"
        }
    ],
    "data": {
        "createUserDetails": null
    }
}

Answer

When I clear my cache, I get the error message again: An error occurred. We couldn't create the following alias: Ilackmann. Try again later.

Answer

When the error above occurs, The call to https://public.console.codecatalyst.aws/graphql returns

{
    "errors": [
        {
            "message": "An internal error has occurred while processing your request",
            "locations": [
                {
                    "line": 2,
                    "column": 3
                }
            ],
            "path": [
                "createUserDetails"
            ],
            "extensions": {
                "name": "InternalException"
            },
            "name": "InternalException"
        }
    ],
    "data": {
        "createUserDetails": null
    }
}

Answer

Please try to start from a "completely" session by opening an incognito window and then start over at https://codecatalyst.aws/explore

Please activate the developer console and if you face and problems again export an "HAR" and drop it over so we can have a look.

Did you have your builder ID created before you started the signup process?

Cannot create CodeCatalyst - Error at first try, then I always get "Alias unavailable"

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