404 Not Found on customer viewing invoice

Self hosted Invoice Ninja - v4.5.13 | White label
No files in storage/logs

New install from Softaculous. Send email to customer. All invoice links are showing 404 when accessing.

I have newly installed from cPanel and imported from JSON all data from a previous install that had failed. I am now getting the above problem. thanks for your help.

It sounds like the value for APP_URL in the .env file may be incorrect.