I have the Reolink doorbell too and I get a good video feed in the video tile on my phone using rtsp://user:password1@10.0.1.34:554. I have also set the doorbell up for ONVIF and use this to get visitor events (instead of using the chime) https://community.hubitat.com/t/reolink-doorbell-receiving-visitor-events-in-hubitat/118573. BUT I have tried on 2 tablets, one running Android 5 which just shows "Decoder Init Failed", and the other running Android 9 which just shows "Reconnecting". I don't know why.
On a slightly different subject... can the video tile support 2-way audio (and does rtsp support it). I know that the ONVIF feed from the doorbell supports 2-way audio. I'm trying to find a way of talking to the person who pressed the doorbell from inside HD+.