This might help:Anybody have any success in actually signing up for this? I get a message that says I have devices on my account that aren't supported -- which is weird because the two I have are an iPhone 8 and an XR. So I click the "supported devices" link and see this, insanely. It's listing only up to iPhone 6S?? This makes zero sense. (And yes, I clicked the arrows -- these are all the phones it shows).
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I got the same message, but just scrolled down the resulting page and there among a bunch of other add-on services was the free filter and I was able to enable it there.