Solved
Samesite cookies
My site returns the following warning on the (latest) Firefox console:
Some cookies are misusing the recommended “SameSite“ attribute 3
Cookie “s_ppv” will be soon rejected because it has the “SameSite” attribute set to “None” or an invalid value, without the “secure” attribute. To know more about the “SameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite
However, according to this page https://experienceleague.adobe.com/docs/analytics/technotes/cookies.html?lang=en#how-do-browsers-currently-store-and-manage-analytics-cookies%3F
If you have a CNAME and use the visitor ID service — your implementation will not be affected.
Well, I do have a CNAME setup. Do I really need to setup an attribute still or Adobe will handle this for me?