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How long has it been since the initial reporting on TU and EX? My new Cap One Platinum started reporting last week in all the 3 reports. I think it reported on EX and EQ on the same day, but TU update took anohter couple of days. But my new Discover card reporting was similar to what you are experiencing with Cap One. It appeared on EX and TU on the same day, but took another 2 weeks to show up on EQ.
If it's a new account just be patient. It will show up. If its an old account then call in and they will fix it .Sounds like a new account though. They report to all 3 CB. Just give it time. Its the CB who don't report all at the same time.