Found out this past Sunday a.m. that West Des Moines Marriott has joined the crowd and has discontinued complimentary breakfast on weekends for platinum members. Sorry to see that benefit go by way of the buffalo. I'll let you know in a couple of weeks the status of this benefit at the Fairview Park Marriott in the DC area.
Thanks to Platinum Elite here's another tip.
When you book your reservation online or over the phone, make sure you have "Mr & Mrs." in the salutation. If you do call prior to arrival, say, "my wife and I are looking forward to staying with you this weekend (or whatever)". This approach let's the Front Desk know in advance, so they can plan to meet your expectations.
Once check-in is smooth and rapport established with the Front Desk, I'll call from the room and say, "I forgot to ask about Concierge for tomorrow morning." If it is a weekend, the Front Desk will say it's closed. Then I say, "I've heard that the (name of the restaurant) crew here makes a mean omelette. In lieu of Concierge, do you have BF vouchers?" If everything prior to that went smoothly, the Front Desk will say, "Swing by when you have a moment to pick them up," or something similar.
The key is engaging the Front Desk in a pleasant interaction without making anyone feel they're on notice. Try it.