Automation stopped working

Hello Everyone,

I had an automation working where a partner of ours would add a date to a sheet that would trigger an email to two different cells with email addresses. This worked fine two weeks ago and today our partner udpated the cells and no email was sent. I (as owner) then went and updated the cells and the emails were triggered.

I changed everyone to Admin but that did nothing so changed everyone back to Editor- Can Share.

Does anyone have any thoughts on why wouldn't the emails trigger. Nothing else changed.