As I found out recently, these features are Geo-locked. Both Pixel & Galaxy phones have this functionality built into the Phone/Dialler app.

In the UK, despite that it's legal for individuals to record their own calls without any consent or notification to the other party, these foreign companies have decided that it's either illegal, or that we're just now allowed to use it, and the features are disabled.

The built-in options are therefore unavailable, and Google seems to have gone on a crusade to make sure these apps in the Play Store are nerfed or removed. APIs that apps could use to provide this functionality have been removed and the only option now is to use he accessibility APIs which involve manually installing apks, and dismissing scary warnings. I don't expect this will work for much longer.

Where's Stallman when you need him...