SharePoint

429 — Too Many Requests (Throttling)

SharePoint has received too many requests from your account or tenant in a short period.

Root cause

You hit the SharePoint Online API usage limits. This often happens during bulk migrations, poorly optimized Power Automate loops, or aggressive SPFx API calls.

How to fix it

  1. Implement exponential backoff in your code (wait and retry).
  2. If using Power Automate, check the flow for "Apply to each" loops without concurrency control.
  3. Batch your REST API requests where possible.

Decode any M365 error

Paste an unfamiliar error message into the interactive decoder — it searches every code in this catalog and explains the cause in plain English.

Open the Error Decoder →