Confirmation error
Suddenly, in the morning, the confirmation of trade stopped working.
Performed login again and refresh session - Nothing!!!

same problem(
same
reinstalling sda did not help
yah, I have same issue. not confirming anymore (for anything, not just trades .. manual gets an error, regardless of trying to confirm OR cancel)
ed: actual device attached to account, it also doesn't work there. so as other person stated, it seems to be a Steam problem, not associated with SDA at all. so only option is to just wait.
Guys it's because of the late night steam update. Just have to wait for it to be fixed.
Same.
Same
Working again!
Not working again. Should be fixed in 7-8 hours.
Should be fixed in 7-8 hours
Thanks for the info