We are on Excalibur.
To get invite back into the FC you will need to find an officer online. If you were in the FC before, then the invite should be just asking (I THINK!).
However, if you were never in the FC, I think you will need to fill out a new application.
More information available in the thread LITERALLY above this one. Also, if this gets bumped down, the link is: https://forums.oldtimersguild.com/t/join-us-in-ffxiv/4263.
–Oni.