So the only time you actually need an IP on the tunnel interface is if you've setup tunnel monitoring, or you are using a dynamic routing protocol to route the traffic.
https://live.paloaltonetworks.com/t5/general-topics/what-is-the-role-of-an-ip-address-on-a-tunnel-interface/td-p/255523#:~:text=So%20the%20only%20time%20you%20actually%20need%20an,a%20dynamic%20routing%20protocol%20to%20route%20the%20traffic.
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Mohamed_Waly
2 days, 12 hours ago