Thanks to Mike and Colin for their feedback on MC2 tracking. Their best tracking element for MC2 is JSpOC-710, object J. See the TLE below.
JSpOC-710 1 90710U 13072J 13348.62284903 +.00013465 +00000-0 +13156-2 0 00148 2 90710 120.4918 256.4723 0298653 349.1771 082.9876 14.64852722001202
Mike, DK3WN, has his decoding client up and running as well. Thanks Mike!