Forum/Support Market
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As the title.

When I change my Trade Offer URL,it will show:The Steam Community session of the bot is expired, it will be renewed automatically. Has already shown up for many times.Never change it with success.

How would deal with it?

You could retry later. This error comes up when the bot has login problems, but it is likely temporary.

Also, you should try with another device to test if the trade offer URL you are trying to use is valid first.