Enduser panel does not load due to error: Load denied by X-Frame-Options

On WHMCS control panel, Virtualizor enduser panel fails to load with browser error:

Load denied by X-Frame-Options: https://YOUR_WHMCS_DOMAIN/admin/clientsservices.php?vapi_mode=1&userid=1&id=4&give=index.html#act=vpsmanage does not permit framing.

Solution:

Verify X-Frame-Options value is not set to “deny” under your WHMCS web server configuration. If it is, then change it to “sameorigin” and restart the web service.

Reference:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options#Examples

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