I did not delete:
# END WordPress
Issue no resolved.
I have followed all the steps listed in https://premium.wpmudev.org/manuals/wpmu-manual-2/creating-a-network-to-enable-wordpress-multisite/ and at the very end when the website was supposed to reset it instead gave this error.
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, firstname.lastname@example.org and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request
I have gone over the steps from the beginning (unfortunately we goofed and did not back up the original wp-config file or .htaccess files but as this is the very start of the creation I assume I can use the default files still from the wordpress installation folder.) and we can not figure out why it failed at the final step of adding the full multisite code.