No commendation for doing guild missions
You need to guest to Seafarer’s Rest to get credit since your guild hosts them on that world. The Megaserver system doesn’t fix the bridge in guild missions, although you might be in the same instance.
Hope this helps!
Yuki
Guild Leader of Ignite The Fire [BURN]
Balance Team [IMBA] – Guardian
Blackgate
Balance Team [IMBA] – Guardian
Blackgate
Was this fixed with the September patch to make guilds cross server?
Yeah, you no longer need to guest for credit.
Source, my last guild missions (did not record the guesting though).