RewriteRule from apache config doensnt function, .htaccess do

Dear team,
we habe a nextcloud installation at the website under directory
/nc
Placeing a .htaccess file under
/var/www/clients/client99/web999/web/.htaccess

Code:

RewriteEngine On
RewriteRule ^\.well-known/carddav /nc/remote.php/dav [R=301,L]
RewriteRule ^\.well-known/caldav /nc/remote.php/dav [R=301,L]
RewriteRule ^\.well-known/webfinger /nc/index.php/.well-known/webfinger [R=301,L]
RewriteRule ^\.well-known/nodeinfo /nc/index.php/.well-known/nodeinfo [R=301,L]

does the job.

Inserting a snippet in Website -> Options ->Apache Directives

Code:

<IfModule mod_headers.c>
      Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"
</IfModule>
<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteRule ^\.well-known/carddav /nc/remote.php/dav [R=301,L]
  RewriteRule ^\.well-known/caldav /nc/remote.php/dav [R=301,L]
  RewriteRule ^\.well-known/webfinger /nc/index.php/.well-known/webfinger [R=301,L]
  RewriteRule ^\.well-known/nodeinfo /nc/index.php/.well-known/nodeinfo [R=301,L]
</IfModule>

or

Code:

<IfModule mod_headers.c>
      Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"
</IfModule>
<IfModule mod_rewrite.c>
 <Directory "{DOCROOT}">
  RewriteEngine on
  RewriteRule ^\.well-known/carddav /nc/remote.php/dav [R=301,L]
  RewriteRule ^\.well-known/caldav /nc/remote.php/dav [R=301,L]
  RewriteRule ^\.well-known/webfinger /nc/index.php/.well-known/webfinger [R=301,L]
  RewriteRule ^\.well-known/nodeinfo /nc/index.php/.well-known/nodeinfo [R=301,L]
 </Directory>
</IfModule>

does not work.
"Apache AllowOverride" is set to "All"

We prefer a solution using the web GUI of ISPConfig. Why does that way not do the job?
Thank you for any help
cmks

 

It is appended to the .vhost config at the end of the VirtualHost *:443 section but not to the *:80 part.
apache restarts w/o any error.