There is a 2nd level security to access phpMyAdmin from network. You need to edit file httpd-xampp.conf on your server.
The following message will be displayed if you were trying to access the phpMyAdmin from network:
1) Open file httpd-xampp.conf which located on your server under directory xampp/apache/conf/extra/
2) Look for the following script in your httpd-xampp.conf:
<LocationMatch “^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))”>
Require local ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>
3) Replace “Require local” to “Require all granted”.
4) Save the file
5) Restart Apache server using Xampp control panel: