Acrobat only — Error 224 on launch (MacBook Air M4, Sequoia 15.7.7) — everything else in CC works fine

Acrobat only — Error 224 on launch (MacBook Air M4, Sequoia 15.7.7) — everything else in CC works fine
System:
    •    MacBook Air, M4 chip, macOS Sequoia 15.7.7
    •    Active Creative Cloud subscription, account in good standing
    •    InDesign and Photoshop both open and run without any problem
    •    Acrobat — and only Acrobat — throws Error 224 immediately on launch
    •    I don't use Keychain
For comparison: I also have a late-2014 iMac on the same network, running macOS Big Sur 11.7.11, same Adobe account. On that machine, InDesign, Photoshop, and Acrobat all open fine — no error at all. So this appears to be specific to this MacBook Air / Sequoia combination, not my account or license.
What I've already tried (all unsuccessful):
    1    Fully uninstalled all Creative Cloud apps and the Creative Cloud desktop app itself, then reinstalled CC and Acrobat only — same Error 224 on first launch.
    2    Ran the official Adobe Creative Cloud Cleaner Tool, then reinstalled — same result.
    3    Manually located and deleted Acrobat's preference files (com.adobe.acrobat.pro.plist and related files in both ~/Library/Preferences and /Library/Preferences) before reinstalling — same result.
    4    Signed out/in of Creative Cloud, restarted the Mac fully, restarted just the Acrobat process — no change.
What I'm not looking for: a suggestion to create a brand-new macOS user account to "fix" this. I tried starting down that path and it just gives me a blank, unconfigured profile — that's avoiding the problem, not solving it. I'd like to find the actual cause on my existing account.
Question: Since InDesign and Photoshop both authenticate and launch fine under the same Adobe account on the same machine, and Acrobat itself works fine on another Mac with the same account, what is different about Acrobat's launch/activation process specifically that would cause it — and only it — to fail with Error 224 here? Has anyone traced this to a specific corrupted file, cache, or service unique to Acrobat (as opposed to the shared CC licensing framework)?
Any help tracing the actual root cause, rather than blanket reinstall/new-account suggestions, would be appreciated — I've already exhausted those.