Why is HTTP/2 not being served on EC2 Linux2 Apache 2.4 although enabled?

Question

I have httpd.x86_64 2.4.43-1.amzn2 and mod_http2.x86_64   1.15.3-2.amzn2 installed with yum in a linux 2 AMI.    
  
httpd -M  
confirms that the http2_module (shared) extension is loaded.  
  
The httpd.conf file includes:  
  
    Protocols h2 h2c http/1.1  
  
An SSL certificate is installed.  
  
I am using php-fpm to serve php code (principally WordPress)  
  
Yet apache is not serving http/2 (tested using https://tools.keycdn.com/http2-test ).    
Example site on this server:  https://www.anticipate.ac.uk/  
  
What could be the problem?

Answer

The problem is that Apache was using MPM pre_fork, when it has to use MPM event.  
  
See https://www.youtube.com/watch?v=zT2iCk7-HLs for an explanation of how to change this.

Why is HTTP/2 not being served on EC2 Linux2 Apache 2.4 although enabled?

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