Error 404: Not Found (Windows, Apache)

[T.T]

Hello everyone,

I'm new to the forum, as unfortunately I couldn't find a suitable answer for myself.
I have Espo running on a Windows Server 2019 with Apache and Espo 9.0.1.
The local installation also works perfectly, unfortunately I can't access Espo remotely.

With my current configuration I manage to access Espo (I see the favicon, etc.), but I get the error Error 404: Not found (as shown in the screenshot)

[edit] I have just updated from version 9.0.1 to 9.0.4. Now only ‘Not Found’ is displayed in the browser, otherwise everything remains the same.
and I have also created a user portal and was able to access it successfully.

Can you please help me as I feel like I'm going round in circles without finding the right way.
Thank you very much

I have attached parts of my config here as code to show you what I have tried so far:

httpf.conf

LoadModule rewrite_module modules/mod_rewrite.so

<Directory C:/xampp/htdocs/espo/>
  AllowOverride All
</Directory>

#test 4 Espo
<IfModule mod_fcgid.c>
  FcgidPassHeader Authorization
  FcgidPassHeader Proxy-Authorization
  FcgidPassHeader HTTP_AUTHORIZATION
</IfModule>
#test 4 Espo
<IfModule mod_fastcgi.c>
   FastCgiConfig -pass-header Authorization \
                 -pass-header Proxy-Authorization \
                 -pass-header HTTP_AUTHORIZATION
</IfModule>​

httpd-vhosts.conf:

<VirtualHost *:443>
    ServerName ####.####.de
    DocumentRoot "C:/xampp/htdocs/espo/public/"
    Alias /client/ C:/xampp/htdocs/espo/client/
<Directory C:/xampp/htdocs/espo>                ###If only to htdocs = Forbidden | with /espo = Error 404 (but Favicon, copyright and BG)
    AllowOverride None
</Directory>
<Directory C:/xampp/htdocs/espo/public/>
    AllowOverride All
</Directory>
    ErrorLog "logs/espocrm-error.log"
    CustomLog "logs/espocrm-access.log" common
</VirtualHost>​

.htaccess (Espo root):

<IfModule mod_rewrite.c>
    RewriteEngine On

    # Forbid access. Not actual as redirect to `public` is applied.
    # An extra security measure if redirect not fired.
    RewriteRule ^/?data/ - [F]
    RewriteRule ^/?application/ - [F]
    RewriteRule ^/?custom/ - [F]
    RewriteRule ^/?vendor/ - [F]
    RewriteRule /?web\.config - [F]
    #nRewriteRule reset/?$ reset.html [QSA,L] #test​

Cron running every minute:

C:\xampp\php\\php.EXE -f C:\xampp\htdocs\espo\cron.php

EspoCRM Setting:

Administration > Settings > Webadress = https://####.####.de