Does it support PHP 8.3.21 ?

[laurentC9]

I got fatal error on Install so, I test 8.1 fatal too.
I note Its a new free install without theme n plugin so I don't understand. What is the best php number and type to use with it ?
Thanks

[superdav42]

PHP 7.4 - 8.4 are supported and I've tested each one. Your fatal error is probably unrelated to the version of PHP being used. Fatal errors can happen if you have a wp-content/sunrise.php file leftover from a WP Ultimo install. Delete this file and then WP Multisite WaaS should activate without an error. If there is still problem check your web servers error log to find the exact cause of the fatal. It will probably also help to enable debugging in wp-config.php. Set:

// Enable WP_DEBUG mode
define( 'WP_DEBUG', true );
// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', true );

to enable logging which will really help determine why the fatal errors are happening.