Schedule a message reminder

I need a single-message reminder to go to Maria and the service team about tomorrow's equipment check at 9:00 AM. Draft the reminder, confirm it's concise, then schedule it to send to the group chat and to Maria privately on Thursday at 9:00 AM; if the message fails to send, notify me immediately.

Before I schedule this reminder, make the intent obvious at the top: '9:00 AM equipment check — confirm attendance.' Pull the check list summary into one sentence, surface any missing attachments or links, and flag wording that could confuse Maria or the service lead so approving is quick.

I drafted a reminder for Maria and the service team about tomorrow's 9:00 AM equipment check and saved it as scheduled for Thursday at 9:00 AM. I'm worried I've either included the wrong group chat or missed someone who must attend. Who should I confirm I included, and how do I quickly verify the message will send to both the group and Maria privately?

Every week I schedule reminders for inspections and someone always misses them or complains about being left out. Where am I losing reliability — wrong recipient lists, unclear subject lines, or poor timing — and which single habit change will stop these misses going forward?