Please check if the PDO driver is enabled in your PHP 8 setup. You can do that by switching to PHP 8 and then go to System Information -> PHP Information and search for PDO on the page. Do this for both PHP 7 and PHP 8 so you can see the difference.
My guess is that the hosting provider has forgotten to enable this in the PHP 8 configuration. If you can enable that yourself, that is the fastest way, otherwise I would suggest to ask your hosting provider to do this for you.
Kind regards,
RolandD
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