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The McpAuthorizationError message means Zapier could not verify the sign-in for your AI client. This usually means an app connection on your server has expired and needs to be reauthenticated.

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Symptom

Your AI client shows the error McpAuthorizationError when trying to connect to Zapier MCP.

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Causes

  • An app connection on the server has expired or been revoked.
  • The connection token saved in your AI client is out of date.

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How to fix it

First, try reconnecting the app that is failing:
1

Open your server

In the left sidebar of the Zapier MCP dashboard, select your server.
2

Select the app menu

Select the menu icon beside the name of the app.
3

Reauthenticate

Select Update authentication and follow the prompts to reconnect.
4

Test again

Try the action in your AI client again.
If the error persists and you are using an unlisted client with a connection token, rotate the token and update your AI client’s configuration:
1

Open your server

Go to the Zapier MCP dashboard and select your server.
2

Go to the Connect tab

In the top menu bar, select the Connect tab.
3

Rotate your token

Select Rotate token to generate a new connection token.
4

Update your client

Copy the new server URL and update it in your AI client’s configuration.
5

Restart and test

Restart your AI client and try connecting again.
If you are using the TypeScript or Python SDK with an API key, this error can occur if the key is revoked. Generate a new API key from the Zapier MCP dashboard and update it in your SDK configuration.

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