Have an issues but not sure of the cause, sometimes the GRE tunnel does not re-establish over a S2S VPN.
Save backup config and check routes
Ensure your S2S VPN config is correct, usually you will see VPN p1 up but GRE tunnel showing as up/down.
shut down both tunnel interfaces on either end
save the router config
reboot the remote router config
bring up tunnel interface in HQ router
Now bring it up on the remote router
Ensure all routes are in place
remote > HQ (tunnelxx)
HQ > remote (tunnelxx)
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