Requests show the literal {{baseUrl}} or {{token}} text instead of the resolved value, causing 404s or authentication failures, even though the variable appears to be defined.
Verify the correct environment is actually selected and understand variable scope precedence between global, environment, and collection levels.
Step-by-Step Guide
Check the environment dropdown in the top-right is set to the intended environment, not 'No Environment'
Confirm the variable name matches exactly, including case, in both definition and {{usage}}
Remember scope precedence: local > data > environment > collection > global
Use the eye icon to preview the currently resolved values before sending
For dynamic tokens, set them via a script in the Tests tab: pm.environment.set('token', response.token)
Avoid wrapping {{variable}} in quotes inside raw JSON unless the value itself needs them
Sync environments across the team using a shared Postman workspace instead of manual exports
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