Email Links for NextDoor App No Longer Work

I have the NextDoor App and when I get emails from them with links to post, it would open directly in the NextDoor App when I clicked them. Then it started going to Safari which would ask me if I wanted to open them in the App in a pop-up like interface, but I had to click it quickly or it would disappear and the link would open in Safari. Now safari has a banner on the bottom that says, "NextDoor for iPhone. It's faster, easier, and free" with a big green OPEN APP button. I click that and it brings me to the App Store and shows the NextDoor app where it says OPEN because I already have the app installed. If I click that, it open NextDoor but doesn't bring me to the link I selected, just the main site. I've tried uninstalling and reinstalling, but that hasn't helped. I tried Removing All Web Site data in Safari, but that didn't work either.

Any suggestions?

iOS9.3.1/iPhone 5S