Check if it's already listed and that's why you're getting an error.
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Steam Status · Is Steam Down?
https://steamstat.us/
There was about two hours of downtime. (Maintenance?)
Probably recovered?
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No one can confirm trades. Therefore, trading is in fact down.
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https://steamcommunity.com/groups/tradingcards/discussions/2/3469477582938414488/?ctp=3
Also happened last week on Steam routine maintenance.
We couldn't confirm any of our trades/market listing, it was down for about 24hrs.
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Is anyone experience this? When you want to trade or selling cards on steam, on the confirmations page, its keep saying error
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