CM3000 Not Locking Upstream OFDMA – Upload Stuck at 63 Mbps on 2 Gig Plan

CM3000 on Xfinity 2 Gig plan. Download is correct (~2313 Mbps), but upload remains ~63 Mbps. Modem shows downstream OFDM locked, but zero locked upstream OFDMA channels. Router bottleneck already eliminated with ASUS RT-BE92U. Looking for verification that my modem/account/node is correctly provisioned for next-gen upload speeds and upstream OFDMA.

Online and call center help is of no help.