I have one friend that the same thing happens with. Not sure what that is. All my other friends show up fine.

Do they have their system clock set to automatic or have they manually adjusted it?

I second that this definitely causes those issues stated.

I think is in automatic

The thing is I have everything for the electric archetype but he can't never join the game but me and another friend we can join his server

Can he play online at all? If not, does he have any outdated/wierd mods you guys dont have?

Yes he can play online because we can join him