I left a message for the plans examiner this morning to schedule him and Mike to meet and discuss code upgrades.
It's a bit awkward and wordy.
I left a message asking the plans examiner to discuss the code upgrades with Mike.
I have asked the plans examiner to meet with Mike about ...
Just ask yourself what's crucial in the message. The time of day is or isn't. Emailing, voice-messaging is or isn't. Meeting or talking one the phone - is or isn't. Re: Meet and discuss - they don't have to meet in order to discuss, also what else are they going to do when they meet BUT discuss? They aren't going to sit there and play cards.