The WireGuard service is not running.

[reza.mnp]

The WireGuard service is not running.
and grayed out tunnel
.

[yon 0]

@reza-mnp

I've encountered it too, it happens quite often, having to start the service manually

[mikee]

This happens for sure if you have some 2.5 version running and the current branch 2.6 selected and you go and update the WG plugin. Version 2.6 of the plugin is not compatible with version 2.5.x and it does not start after updating.

May this be your case?

[netgate483]

@reza-mnp - settings / enable wireguard - that is it done.