The output from the show ip nhrp nhs detail command on the spoke router indicates that the Next Hop Server (NHS) registration requests are failing (req-failed 30 repl-recv 0). This suggests that the spoke cannot successfully register with the hub, which is a requirement for DMVPN (Dynamic Multipoint VPN) to function correctly.
To resolve this issue, ensure that the correct NHS (Next Hop Server) is configured on the spoke router using the correct IP address of the hub.