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I've been experiencing this issue for several days: 'Trade offer URL invalid. Your trade offer URL is unusable. Please verify your trade offer URL and retry.' I have changed my trade offer URL, but I get the same message when I click 'Save' to apply the change.
Replies

Same issue here

After 4 days, it's working again. I'm not sure if you fixed it or if it resolved on its own, but it's working now

Sometimes the server IP got included into the Cloudflare blacklist, causing nearly all outgoing connections to fail, ignoring the fact that I'm connected to Cloudflare with Argo tunnels. Faking another MAC address and change the server IP address everything are fixed.