If you are trying to use the old keyboard shortcuts, Adobe changed them in Camera Raw 12.3. They are simpler now (fewer keys to press), and if you also use Lightroom Classic the panel shortcuts are now consistent in both applications.
In previous versions of Camera Raw, you opened the panels in Windows by holding down Ctrl+Alt and pressing a number key.
In Camera Raw 12.3 and later, you only need to press Ctrl plus a number key. So to open each panel, press
Ctrl+1 for Basic
Ctrl+2 for Curve
…and so on.
Despite the Adobe reply earlier, I do not think there is a bug here, unless the new keyboard shortcuts are not working.
Also, because this is a Camera Raw question, there is a specific forum for Camera Raw separate from Photoshop.
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