Steps to follow in case of Scammer/ Multiples Account / Winner not Accepting Prize

Seven days after a giveaway ends if the winner hasn't accepted you can create a support ticket and ask for a reroll / new winner: https://www.steamgifts.com/support/tickets/new

You should be able to see his email, since he won your giveaway. Try to send him a message there. Also, if he has any discussions here on the forums or has posted a comment on a giveaway he's won, you can contact him that way. Keep copies/screenshots of these messages to include in your support ticket.

Then if a full 7 days have passed, as the above poster mentioned, fill out a support ticked requesting a new winner if the key hasn't been revealed. If it has been revealed and he has the game registered in his steam account, you can instead request that mods mark it received. If the key has been revealed and the game is not registered in his account, you might want to instead request the giveaway be canceled since he might have activated the key elsewhere or sold it on a trading market.

Here's a link to the FAQ for your reference. You want to read the answers under "what do I do if the winner of my giveaway has not redeemed their gift"

On what grounds do you think the winner is a scammer or is using multiple accounts?

Try blocking and then unblocking them and try to add them again as a friend.

Like others before me said, the winner has 7 days to activate the key so wait those days and if they never activate, you can try to contact them and if that fails make a ticket to support.

How many times did you try to send him a friends request? That error has been known to happen when you send a friends request and cancel several times.

Wait 7 days period, many times people might be online on Steamgifts but accepting gift with a delay. One time winner from my giveaway accepted gift in a month due to personal reasons. Some people just not receiving gifts as soon as they won them, so i stopped worrying about it long time ago. Also what is important is key revealed or not, if its revealed you will need to write support about it if 7 days are over, key revealed but still not marked as received. And scamming that way is really rare IMO, i never saw winner trying to pull something like that in my 2 years here.

Thank you all for the information, it was really helpful since I did not know some of the stuff you mentioned.

The winner accepted the prize, however now I know the process in case this happens (how long to wait and how to report)

Thank you again and Stay Safe!

i got same problem, but winner marked as NOT RECEIVED. I asked him why he doesnt activated first, then told him its an email from HB. I have proofs that i send him gift to email associated here with SG. One week and support is so silent, no answer...i dont know what to do xD

Lol, these troubles of level 0 giveaways ... such classic

If it gives you error probablly that user had blocked you ...

A winner has 7 days time to accept your gift (you have the same time to send the gift.)
If he doesn't, or he declines the win, you can message the support to ask for a reroll. Refer to a comment the winner wrote or send them any other legit proof.
It's not necessary a scam.

I see the "problem" got solved.

For the next case:
Wait 6 days, write the winner after that time a message, make a screenshot of it. Send this screenshot in the "reroll request ticket" at day 7 to the support.

I also noted that there are multiples comment on his profile from other people on this community requesting him to accept the prize.

If a lot of people write such stuff at someones profile he is not very active or use a autojoiner and come only each few days online to collect the wins.
You need to run often, for days, behind such ones that they please please please take their wins.... (puking)

Special with such winners check them with https://www.sgtools.info/activation and https://www.sgtools.info/multiple-wins, and if they have a red mark appearing there send a reroll request ticket to the support, before you send the key.

I am going to give you some advice for both this and future events.

1. Document your attempts to contact your winner. In the event you decide to create a ticket, Support will ask for said documentation. (Screenshots are most commonly used because they are easy to create.)
2. If you are still unable to contact your winner by the sixth day, toggle the key "off" so that it can no longer be viewed by your winner. It is simpler (and safer) to re-roll a giveaway when the key has not yet been viewed by the winner. (For myself, I do not give out a key until after I have contacted my winner.)
3. Seven days after your giveaway has ended, assuming you are still unable to contact the winner, create a Request New Winner ticket. Be sure to include an explanation and any relevant documentation. Failure to include required information will delay resolution of your ticket.

Is there a way for a winner to collect a key without logging in to SG? My winner had they game in his inventory when I check 20 minutes after it ended but had not been on SG for an hour. Just curious.

I tried key on my account because I own it and it just says I own it not that it has been used.