Red Hat Bugzilla – Bug 1471044
error in ./apachectl configtest
Last modified: 2017-08-30 13:28:49 EDT
If this worked with httpd24-httpd-2.4.25-9.el7 it's likely because mod_http2 wasn't installed.
1) scl enable httpd24 'apachectl configtest'
2) service httpd24-httpd configtest
^ those are supported ways to run apachectl, running apachectl directly from outside the SCL environment is not expected to work.