Scrutiny of others is a hard thing to deal with. Really hard.
Even the best restaurants in the world let people down at times. Even the best IT people create issues they didn’t predict.
We all let our customers down at some point. How seriously you take that problem is what matters. How can you make it right? Can you make it right? Can you change the expectation in the future? That’s what matters.
You’re going to let someone down, just do your best to minimize it and in the meantime make as many people happy as you can.