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I've started investigating anything because Pro Tools won't play since upgrading to Big Sur.
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What exactly does this mean? Not show up as an option in the playback engine dialog? Or not play as in the transport does not go into play? If so what exactly happens on the screen, what transport buttons blinking etc. (and if you use Built-In Output as the playback engine the problem is not there?
HD systems... always try minimal systems troubleshooting. What happens when you pull out the new HDX card? What happens when you put that card in the original HDX slot? Test with the simplest possible config, one interface connected. A known good Digilink cable or swap several cables to check. If only two cards fail, try different card link cable. Always suspect power cables etc.
How did you upgrade to Big Sur? If it was not a clean install you may want to just spin ip a clean install on a spare drive or partition, install Pro Tools and not much else and see if that works.
If the device is not showing up in playback engine options then problems with device driver security approval would be high on my suspect list.... except if it runs DigiTest that should not be a problem.
What did Avid support actually troubleshoot with you? What version of the driver is installed?