It just depends on who's looking at the join requests at that time. They probably rejected it because the name looks like the phrase "true salvo". Try something without words that don't sound like names.
He was declined because his requested handle sounds like "true salvo" - a combination of real words, and not a name (as Xim suggested). I can state this with absolute certainty since I declined him. His slightly altered variation seems to have been accepted.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."