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This has been happening for a week or two - cannot cast GBOSanc in a sanctuary area after death in battlegrounds, Wintergrasp included. I believe it deducts a reagent, but the buff is not there. Once you move a few feet away, it seems to work - but it should work immediately upon resurrection.
Post it on bug tracker if it's not already there: https://www.warmane.com/bugtracker
It probably happens because while you are in a sanctuary, your spells can't affect players who are not in a sanctuary. And since your GBoS tries to affect both, it probably fails.
you can't cast any shout as a warrior either, and as far as I can tell you can stay at the same spot and just wait a few seconds and then it works.