> ## Documentation Index
> Fetch the complete documentation index at: https://developers.tassyir.io/llms.txt
> Use this file to discover all available pages before exploring further.

# APP_TOKEN_INVALID

> HTTP 401, from every operation of the Admin API.

Its problem `type`: `https://developers.tassyir.io/errors/app-token-invalid`.

## What to do

HTTP 401. The token is unknown, expired or revoked, or its installation or app is
no longer active. Refresh it once (the SDK does). If the refresh is refused,
the installation was uninstalled, suspended or had its scopes changed: an
embedded app gets a new token on the next page view, a headless app needs a
new install code.

## Answered by

Every operation of the Admin API, with HTTP 401.

The shape of every problem, and how `@tassyir/app` reports it: [Errors](/guides/errors).


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