Block them, then unblock them, this usually works for me.
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Any idea what went wrong and is it only me having this problem? I can accept invites, but it seems I cannot send them to anyone, tried with a lot of profiles today, both from Steam client and through browser and it gave me an error all those times. It's been hours since this issue is happening too, any idea what that should be and am I the only one having it?
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