Tried it on an Android and I found a bug If you go editing the favourite by going into Favourites and clicking on then little down arrow on the right hand (Very hard to click) it shows both None and Instant but none are highlighted. But if you go into the favorite by clicking on the word on the left and then to to the heart up the top you can switch between None and Instant (The X on the Android is the same as the Done on the IPhone) and it works (i went to my iphone and refresh and it's shows I changed it)

It's not my site.. just one I used. You have to give the link :-) I've just got my Android out (Charging) and see if I have a similar issue.

On the Iphone it looks like https://postimg.cc/grQgWDSX

When you go into Notifications (Iphone) you see Notifications and you can choose None or Instant. Just choose the one you want and click on Done (Right hand corner) and works fine (for me).

Thanks. Yes it is a good feature to have and should be better when the rate limits increased. It would be great if the email could be instant (or hourly too in the future) thanks