CSP Security headers are not working

Did you check this discussion: https://www.ads-software.com/support/topic/http-response-headers/

You can add headers to your .htaccess if you want.

Hello,
how to add CSP headers in .htaccess
because when we turn on from Firewall it was not working
Thanks
Vikas

You’ll find some examples here:
https://help.dreamhost.com/hc/en-us/articles/215747598-Setting-headers-with-an-htaccess-file
Apache mod_header documentation:
https://httpd.apache.org/docs/current/mod/mod_headers.html