Ring Pro does not does not find iPhone AT&T Mobile Hotspot

We recently built a new home on 105 acres in a rural area. We do not currently have any access to broadband internet except for our mobile hotspots on our AT&T iPhones which have 30 GB per phone of hotspot. However, the local electric company has been working on installing fiberoptic cable for internet in our rural community and we have fiber optic ran to our electric pole near our home but it will still be another 4 or 5 months probably before we have the hookup in the house. Thankfully, we built our house on a hill with a cell phone tour in view and we get 40 to 50 mbps download speed and between 2 and 10 Mbps Upload speed on our AT&T iphones. We are able to watch movies on Amazon Prime with no issues, etc using our hotspots on our SamsungTV. I recently purchased and installed a Ring Doorbell Pro and planned on using it with our iPhone AT&T hotspots until the local fiberoptic internet is installed, but the Ring Doorbell Pro is not finding the mobile hotspot coming from either of our phones. I know that we won't be able to use the doorbell when we are away from home, but I was still hoping to be able to use it while one of us are home until we get the permanent broadband installed in a few months. Does anyone know why our mobile hotspots are not being recognized? Any solutions?