Grand Company Promotion not available

[ItMe]

Have your squadrons completed the necessary missions?
They need to clear benchmarks before the next quest becomes available.

[Sumtingwong]

Have your squadrons completed the necessary missions?
They need to clear benchmarks before the next quest becomes available.

Sorry should have elaborated when I said I had completed squadron content, I mean all 8 of my squad mates are level 60 and all squadron missions are complete, all command missions complete. There's nothing more to do with squadrons.