What’s the most overlooked step before an AWS migration?

A migration can have a solid AWS architecture, a clear timeline, and a well-defined budget — yet still run into problems before migration day.

For those who’ve worked on AWS migrations:

What’s one thing organizations most often overlook during the planning stage?

It could be technical, operational, or related to business and team readiness.

Have you seen a small gap in planning turn into a bigger issue during the migration?

What happened, and what would you do differently next time?