IPsec with Watchguard

Hello all,

We are trying to setup a site to site VPN using IPsec between Mikrotik and WatchGuard but with no luck so far. In terms of parameters it does not seem something wrong, while are exactly the same on both ends, however Watchguard logs that

Starting phase 1 negotiation using [Gateway-To-Fotis] to 195.x.y.z:500 main mode  	Debug 
Member1 iked (193.a.b.c <->195.x.y.z) WARNING: Mismatched ID settings at peer 195.x.y.z:4500 caused an authentication failure  	Debug

I tried different settings under “My ID User FQDN” but I thought that it quite irrelevant. It is not clear what this kind of ID is. Is there anybody that successfully such a case? Any help is appreciated!