Spoke with the Mosaic Line a few days back & the agent - who seemed competent - stated that they now have to ability to check for you how many M2M certs would be required for any particular routing.

It's obviously a band aid for a bullet wound & way too little too late, but I would suggest those attempting to use M2M certs to call the Mosaic Line from the start from now on & hopefully it'll be a less time-intensive process checking through viable options. She was very apologetic & definitely understood how bad a look this was for Delta status matchers, who, for the most part, had many similar type of issues redeeming GUCs up until this point.