Apache displays localhost but not the domain

Hello there!!

I just followed this tuto https://ift.tt/2KiMtjq
but when it comes to test, at the end of the topic, the http:// localhost displays well my site (actually just the validation of a server block working) whereas http:// mydomain (here http:// legroove) send a 404 error.
I have probably messed up one of the commands? But I think no.

Thank you in advance for all the help you could give me!...

Apache displays localhost but not the domain

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