Cpanel EA4 php 8.1 500 error

I’ve attempted installing php8.1 via cpanel EA4, with supposed success. Although, no matter what I’ve tried I’m throwing 500 with 8.1, while all other appropriate php versions work just fine with v9. Googling, I find other cms platform specific results, but nothing overwhelmingly obvious to me so far that would apply here. Curious if anyone else here has encountered this, and what might be the issue?

Tech support scratched their heads for a while, then installed the modules that didn’t install. Not much detail to report, but rolling again!!

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