A personalized learning assistant on AWS rarely fails loudly. It fails by being helpful to the wrong student. Five failure families that decide whether an AI tutor built on Amazon Bedrock is safe to put in front of a class: LTI identity, retrieval isolation, guardrail limits, the cost shape of an academic term, and being able to prove what the assistant saw.
A user pool set to "MFA: Required" can still let clinicians in on a password alone. This is a practical guide to Cognito MFA for healthcare apps: why federated users bypass enforcement, how the account recovery collision locks people out, why required MFA and adaptive authentication cannot coexist, and how to make session lifetimes match what your documentation claims.
The demo works, then someone sees records they shouldn't. Nothing errors. Here's how to build a Salesforce AI assistant with Amazon Bedrock that respects your sharing model: which doors AWS and Salesforce just closed, why identity propagation is the failure mode that bites, and how to shape the tool surface so the agent can't wander.
Getting Tableau or Power BI to return rows from your data lake takes an hour. The problems arrive three weeks later. Here are the four access patterns worth considering, why fine-grained security and cheap dashboards pull against each other, and the cost levers that actually move the invoice.