Television Studio Pro HD and BMSC Pro 6k control

Hello, good morning. I have an issue with the Blackmagic Studio Pro 6K cameras and our "ATEM Television Studio Pro HD." When I connect the cameras via dual SDI (input and output), I can perfectly control their colorimetry and have tally and talkback. However, when I connect them via HDMI, I can't control them or have any of the previously mentioned features. This doesn't happen when we connect them to our ATEM Mini Pro ISO or our Mini Pro. It only happens with the Television Studio Pro. I've tried updating the ATEM software, which is currently at version 8.1.1, but it won't update, and I assume this is the latest compatible software. Is it impossible to control the BMSCP 6K via HDMI on the Television Studio Pro HD? Is there any pending software update that would allow us to do this? Thank you.

I know it's been a while, but I figured I'd respond for anyone viewing this in the future. I just got off the phone with Blackmagic Support about camera control over HDMI. They said the HDMI inputs on the ATEM TV Studio Pro HD do not transmit camera control back to the cameras, but the ATEM Mini models DO transmit camera control over HDMI.

I cannot confirm whether tally and talkback are supported over HDMI on the ATEM TV Studio Pro.