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Trying to add the Content Security Policy to the header and working with our web developer.
We’ve added the code properly both trying and plugin and directly in the page, but when scanning with securityheaders it doesn’t register as appearing in the header.
We cleared all caches too
Any suggestions?

What is the site URL? Where/how are you adding the CSP? Where are you hosting or what is your server setup? These answers will help.
What “header” are you referring to? I ask because you mentioned putting something into a “page” – and that’s not where CSP “headers” go. What plugin did you try?