For the life of me, I can't remember if you addressed this in your Bridge or Raw Classes:
After going through the ACR flow chart, I opened the photo in Ps. I wanted to take note of the WB temperature so went to Ps > Filter > Camera Raw Filter. Once ACR opens, all sliders are defaulted to 0 and WB is limited to As Shot, Auto, or Custom (the presets aren't available).
Albeit I can make temperature adjustments in Ps, it's best to get it exactly the way I want in ACR before clicking Done or Open in ACR.