I tried looking through the support but did not find an exact answer in regards to forms being hosted on company site, i.e. not a Marketo landing page.
I am using Chrome Canary 81.0.4020.0 and see the warning message:
A cookie associated with a cross-site resource at <URL> was set without the `SameSite` attribute. It has been blocked, as Chrome now only delivers cookies with cross-site requests if they are set with `SameSite=None` and `Secure`.
It also references Cookies default to SameSite=Lax - Chrome Platform Status and Reject insecure SameSite=None cookies - Chrome Platform Status
The actual error that is concerning is attached below and appears to be an authentication error for forms2.min.js
Everything is working as intended on FF, Safari, and Chrome 79.0.3945.88 and so I just want to be prepared if this issue is associated with cookies or something more serious.
Thanks
The problem is not confined to Marketo (and it doesn't have to do with the blocked cookie, that's a different matter -- a concern in its own right, but different).
The problem is that CloudFlare may throw 403 errors when Chrome 80+ is used -- and that's any site that uses CloudFlare's proxy service, not just Marketo.
For example (you may not find this reassuring, but you should) this is the console output when I load my CodePen CSS styles (which have nothing to do with Marketo) from a CodePen page that also hosts a Marketo form:
Don't get me wrong, CloudFlare is a janky choice for a site like Marketo that doesn't allow separate developer access, but millions of sites use it.
As for a solution, I have something in mind, but it's going to be pretty crazy. You may want to wait to see if Chrome and CloudFlare can work out their differences before release.
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