Wireguard on RT2600ac : can't connect completely from iPhone

Hello again,

I'm running some trouble to achieve a working connexion from an iPhone.

Here the log from the wireguard app on my iPhone:

It seems the connexion is started, but can't achieve completly.

Do you know how to make it work?

Thanks in advance.

PS : I tried the .conf on my mac, through my iPhone share connexion 4G via USB. And my mac can't get a valid connexion too...