# try_fetch_auth_descriptor · FT4 Rell API · Chromia Docs (concept)

> function try_ fetch_ auth_ descriptor(account: account , auth_ descriptor_ id: byte_ array): account_ auth_ descriptor ? Retrieves an account_auth_descript

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.auth/try_fetch_auth_descriptor/

FUNCTION

# try\_fetch\_auth\_descriptor

```signature
function try_fetch_auth_descriptor(account: account, auth_descriptor_id: byte_array): account_auth_descriptor?
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/authentication.rell#lines-273)

Retrieves an `account_auth_descriptor` given the account it's associated with and the
ID of the auth descriptor itself. Returns null if not found.

**Parameters**

* **account** — the account the auth descriptor is associated with
* **auth\_descriptor\_id** — the ID of the auth descriptor to retrieve

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.auth/try_fetch_auth_descriptor.html)Generated API reference, mirrored from the live docs