Glad to hear the original problem has been resolved.
Please consider marking my post above with the Solution tag. It will automatically place a check-mark next to the topic’s title which signals to other users that this topic has been resolved. This helps users find answers to similar questions.
For more information about the Solution tag, refer to guideline 21 in the FAQ.
Regarding the new issue, go to Developer Tools > Services and enter script.evening_briefing in the list of services. If the script is not in the list then it means it was never loaded by Home Assistant. Let me know if it appears in the list or not.