Cloudflare Workers R2 PUT Object — AccessDenied due to IAM Policy Missing

What this error means

AccessDenied: You have been denied access — R2 Object Storage operation forbidden by bucket policy is a Cloudflare failure pattern reported for developers trying to fix cloudflare workers accessing r2 object storage returning accessdenied — debug bucket policies and worker bindings. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Cloudflare R2 requires explicit Worker-to-Bucket binding plus bucket policies. Common misconfiguration causing silent failures in production. Not covered by existing Cloudflare entries (only 522/525 proxy errors). Category: Cloudflare per mapping rules.

Common causes

• Cloudflare R2 requires explicit Worker-to-Bucket binding plus bucket policies. Common misconfiguration causing silent failures in production. Not covered by existing Cloudflare entries (only 522/525 proxy errors). Category: Cloudflare per mapping rules.

Quick fixes

1. Confirm the exact error signature matches AccessDenied: You have been denied access — R2 Object Storage operation forbidden by bucket policy.
2. Check the Cloudflare account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://developers.cloudflare.com/r2/
• https://community.cloudflare.com/

Evidence note: Cloudflare R2 requires explicit Worker-to-Bucket binding plus bucket policies. Common misconfiguration causing silent failures in production. Not covered by existing Cloudflare entries (only 522/525 proxy errors). Category: Cloudflare per mapping rules.

Related errors

• Cloudflare

FAQ

What should I check first?

Start with the exact AccessDenied: You have been denied access — R2 Object Storage operation forbidden by bucket policy text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Cloudflare workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without AccessDenied: You have been denied access — R2 Object Storage operation forbidden by bucket policy.