How updating your AWS CLI config can eliminate repeated SSO login prompts

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Developers using AWS IAM Identity Center frequently encounter token expiry errors that force them to run 'aws sso login' multiple times a day. The root cause is often an outdated AWS CLI config file that uses a legacy format, which does not support refresh tokens properly. AWS SSO actually relies on two tokens — a short-lived access token (~8 hours) and a longer-lived refresh token (up to 90 days) — where the latter is meant to silently renew the former. The legacy config style repeats SSO settings inside every profile and never shares a refreshable session across them. Migrating to the modern 'sso-session' block in ~/.aws/config centralises session settings, enables refresh token support, and allows a single login command to cover all configured profiles.

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