If your Steam account is fully trade-ready, then it could be that some skins are not accepted by our system. Make sure that your Steam profile is set to public and that your Trade URL (?) provided is correct. If you have recently received a skin in your Steam inventory, it will be restricted by Steam for 7 days until you are able to trade it again.
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If you're still having problems, this is usually due to Steam connection issues (?), in which case you should wait a few minutes and try again.
If the problem persists for more than 10 minutes, please contact support