RESOLVED - FRAME-ACCURATE TIME CODE ACROSS MULTIPLE FUJIFILM XH2S/XH2.
With the recently released 5.10 firmware, it is now possible to jam-synch these cameras to the Atomos Ultrasynch Blue Time Code generator. Bluetooth pairing between XH2S/2 with the Atomos is tricky - turn on the camera, go to TC Settings>Time Code Synch Setting> Pairing Registration, and start the search. Turn on the UltraSynch Blue, go to Bluetooth settings, and start the search. The camera will appear on the Atomos display after a few seconds, select it. On the camera, a message will appear indicating a connection to the Atomos. Now the Atomos is registered with the camera and will appear in the registered devices section of the Bluetooth menu. Going forward turn on the Atomos, on the camera go to>TC settings>Time Code Synch Settings>turn on the "Connect to Atomos AirGlu BT" for each session. To get time of day TC into the Atomos install the Ultra Synch Blue app' on your phone and jam the phone time to the Atomos. According to Fuji and Atomos documentation, it is possible to synch six cameras to the Ultra Synch Blue. I am shooting a documentary with multiple XH2S' and having frame-accurate matching time code is a huge benefit in editing. Thank you Fujifilm!!!!!!!
I got mine at https://www.bhphotovideo.com/c/product/1569940-REG/atomos_atomxsybl1_us_ultrasync_blue_with_usb_c.html