Panasonic BD player doesn't detect SSD

SanDisk 4TB SSD Extreme Go Portable SDSSDE50-4T00. NTFS.
Panasonic DP-UB820. Firmware is up to date.

Panasonic manual says USB drives up to 4TB are supported. “FAT12, FAT16, FAT32, and NTFS file systems are supported.”
Manual says playback of MKV files is supported.

Player doesn’t detect a SanDisk 4TB SSD, NTFS file system, on either front (USB 2.0) or rear (USB 3.0) port. It does recognize a 8GB USB stick.
Player won’t play MKV files from the network connection (DNLA server), or any type of USB drive.

What gives?

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