Even after all above efforts you might still running into issue and your test results shows HTTP2 is not supported. This is due to the fact that Apache 2.4 pmp_prefork module stopped supporting mod_http2, and you’re likely to see this error in your Apache2 error log:
AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
Since mod_php module uses mpm_prefork module, the workaround is to disable mod_php and and pmp_prefolk and install and enable php-fpm and pmp_event:
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