Not sure what else to try - Ring doorbells will not connect to new modem

I recently upgraded my modem. Previously my ring devices worked fine. However, with this new modem none of the 4 will connect (2 gen 2 doorbells & 2 spotlight Cam Plus) I’ve had my provider look it over and even had them send me a new modem/router to see if that would work. Nope! I’ve tried getting the chime pro to connect the devices to. That didn’t work. I’ve reset and removed devices to try to add them “fresh start”. I’ve done the basics of turning things off and on again. I’ve talked to ring support twice… Nothing works and I don’t necessarily want to buy an all new set up but not sure what else to do :( The struggle be real. Any suggestions?