Why must UAT be performed on Tier-2 or higher environments?

Short Answer
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Answer:

UAT cannot be considered complete if performed only on:

  • Local VMs

  • Privately hosted environments

  • Developer-used systems

Reasons:

  • Tier-1 topology differs from production

  • Performance testing is unreliable

  • Integrations, workflows, printing, WMS, and retail devices behave differently

Tier-2+ Microsoft-managed sandboxes closely match production topology.

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