i cant find my celestial invitation, i checked all my toons no quest or quest items, i did the achievement for it, but i cant find it. i put in a ticket and blizz told me to ask here.
That one kind of sucks, because it’s a meta achievement and you can’t mouse over it to see which of your characters completed it 
If you have checked all your characters, their bags, and their banks, you might have done it on a character you deleted. The invitation goes to the character that collected the last pet.
If that’s the case the only thing you can do is keep marking the ticket as unresolved until you get a real person and not an automated response. You can’t do anything like cage the pets and re-learn them to re-earn the achievement to get another one, so the only way for you to get another invitation is for Blizzard CS to generate another one for you.
Sorry there wasn’t more we could do to help! 
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i dont have stardust.
I know; I looked at your profile. You need the invitation to get access to Algalon the Observer to fight him to get Stardust. However, if you can’t find that invitation on any toons/bags/banks you need to speak with Customer Service and have them generate another one so you can go fight Algalon.
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tyvm my kind person you have been of great help i truly thank you.
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Hi, I have exactly the same problem. I completed the achievement five months ago and never noticed that it had a reward, until today when I looked for how to get the pet “Stardust”. I looked at all my characters to see if I had the item or the quest, but nothing. Did you manage to solve the problem? Thanks!