You need to follow the below sequence while onboarding Control Tower Account:
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Audit
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Log Archive
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Other Accounts
Why this matters: Control Tower's Audit and Log Archive accounts hold the centralized logging and compliance data other accounts depend on — onboarding them first (before the rest) avoids gaps in that dependency chain.
Click on the below link to onboard the AWS Control Tower Billing Account
AWS Billing Account Onboarding
Troubleshooting
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If onboarding fails, confirm that the template was launched in the correct AWS management account and Region.
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If a permission error appears, verify that the required stack and role resources were created successfully.