Update
Ok, I was sure that either the app didn’t work or my phone didn’t work. Vibrate was turned on. Everything. I then went into sounds, ringtones, scrolled up to Vibrate and you can create your own pattern. Tried it but didn’t work. So, I thought my phone must be broke. I found a video that showed me where to go. General/Accesibility/Vibration was turned off and as soon as I turned it on there, it worked. Try it. Might work for you. Devs, you might remember this one. My friend also had this problem. Worked for both of us after we thought everything was for sure on.
No matter what I set, my phone won’t vibrate. Yes, it is set to vibrate on Ring and vibrate on silent is turned on.