Noob mistake: "restricted from your country" steam gift fail

I checked your inventory. The gift copy is not region locked. I guess the game must be locked specifically for your country. (?) I am sure it can be sorted with SG support and the GA creator (?)

Only hit "received" after a win is in your library! You can click "received" again, to avoid problems.

Contact the GA creator and try to determine if the game is only blocked in your country (e.g. Wolfenstein - New Order ROW can not be activated in Germany) or if the gift is restricted to the GA creators region. Try to reach a settlement (deleting the GA, ....). Again only click "received" after you added the game to your library!

1. unmark the game as received
2. tell the creator, that the item cant be activated in your country and send the item back to the creator!

as it seems, you cant activate it in your country but its a raw-version -> ask for a reroll :(

probably a 4-pack spawned copy since they don't get region tagged.

leave the ga feedback unmarked, and contact the creator.
it's up to you if you want to give the game back to him and allow a reroll, delete the ga, or mark as not received.

btw, don't mark as received without activating the game. do both at the same time to avoid problems here.

I saw someone had the same situation like you before, probably that the creator lived in region-locked country, then actived that game, that game somehow was special, gave him +1 gift in inventory, the gift doesn't say its locked, but it was tied with region at first place. Have no idea why Steam keep it that way.
Follow some advices above, you'll be safe.

Based on your Steam profile, you're from the UK, which doesn't have as strict region restrictions as other European countries.
It depends on where the game was bought, and if the region the user bought the game from is restricted.
I know here in SA I can't buy Steam games using my wallet as GAs on SG because it's restricted to that region only, unless I create a region-restricted GA.
Seems more likely, then, that the issue is with the GA creator. Better to ask them directly.

What game is it ? If there is no warning message on the gift, most likely it is an extra gift spawned when activating a key of the game, or opening a 4-pack. These gifts are always locked to the region where the original copy was activated, so probably the giveaway creator wasn't aware of this and thought it was region free.
There is also a small chance that for some reason the game isn't available in your country and cannot be activated even if region free (you should be able to check that on SteamDB).
Contact the giveaway creator to explain the issue and return the gift to them. Then either they are able to get you a region free copy of the game, or they cannot and in that case the best thing to do would be that you give them your permission to delete the giveaway.

1. Do not mark a game "received" until it is in your library.
2. Toggle off the "received" status of your current win because you cannot redeem it.
3. Contact the creator to work out some way for him to send you the gift you were promised.
4. If the giveaway creator refuses to provide you the game promised, simply mark it as "not received."
5. If the giveaway creator asks you for permission to delete the giveaway, you may post your acceptance in the giveaway's comments section.

Cheers guys.

I've unticked RECEIVED and have sent a message to the guy. He's not been online in a day or two, so it's not resolved yet, but thank you all for the advice.
The important take away from it is that I've learned not to hit received until I actually, actually receive the game!

Some time ago i traded a Rise of Nations copy aparently ROW, but i was unable to activate it too

Some games that you get from 4-pack opening or 2-packs opening will get you gifts that are region restricted (if the person opening the gift is in a region-restricted zone) but does not show on the gift itself. You might have gottten one of those

i have Frozen Synapse gift that doesn't have any region restriction marks, but cannot be activated. i assume it's from a "second-free copy" of one of the regions like Ru-CIS.

Sometimes when you acitvate a gift and get another gift for activation (2 pack like that game about pigs) it becomes region locked to the region where 1st gift was activated, without mentioning it at the gift. Send the gift back and tell the gifter its region locked.