There's a link to check a DVC reservation, unfortunately I do not have it -- someone will come post it I'm sure.
I have had DVC reservations show up in the regular Disney system and some have not. Recently, they have been fine though for me.
If you don't get the link quickly - you could try to do it on the Dining reservation of the Disney site, but that approach is not foolproof either. But I was able to retrieve my DVC reservation # there when booking dining.
When you get to the reservation, click on "View Details". It will show that you have the dining plan. If it doesn't say it, check back with MS to make sure.
When you get to the reservation, click on "View Details". It will show that you have the dining plan. If it doesn't say it, check back with MS to make sure.