Acme-Challenge on Apache 2.4 fails on some virtual hosts, but some not

I just posted this on #StackExchange: If you know the answer, please help me. :-) I need to update certificates for https://git.mxchange.org and https://searx.mxchange.org (which is some-why returning 403 on any requests).
#StackExchange acme-challenge apache2.4 letsencrypt
Fixed, please refer to my own answer.
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