Despite boasting 65 per cent possession in the Midlands, the Blues couldn't build on last weekend's 1-0 home win over Watford.
"It's not the result we want on the back of the home victory we've just had," said Iwobi. "We're disappointed but we're not going to dwell on this.
"I felt sharp to be fair, I felt good. But it would have been a better debut if we'd won.
"I had two chances. After the first one that got blocked I thought maybe if I keep going I'll get another... and I was able to do that.
"When I struck it with my left foot I thought it was going in but I saw it come off the post and I was disappointed.
"You can see we are able to create a lot of chances, not just when I came on but even before that.
"We have a lot of attacking players who are able to bring quality and, hopefully, I'm able to add to that as well."