# Error 45003, Wrong client ID given, invalid\_client

**URL:** https://forums.nylas.com/t/error-45003-wrong-client-id-given-invalid-client/602
**Category:** Question and Answers
**Created:** [December 30, 2024, 11:03am UTC](https://forums.nylas.com/t/error-45003-wrong-client-id-given-invalid-client/602 "2024-12-30T11:03:15Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Kateryna](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@Kateryna](https://forums.nylas.com/u/Kateryna)
#### Post date: [December 30, 2024, 11:03am UTC](https://forums.nylas.com/t/error-45003-wrong-client-id-given-invalid-client/602/1 "2024-12-30T11:03:15Z")

</div>

I’m submitting a request to get a grant, but it’s not working. I have an account created after migrating from version V2 to version V3. If I try this with a test account, everything works.

```auto

        const response = await fetch('https://api.us.nylas.com/v3/connect/token', {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Basic ${config.NylasApiKey}`,
          },
          body: JSON.stringify({
            client_id: `${config.NylasIdClient}`,
            client_secret: `${config.NylasApiKey}`,
            grant_type: 'authorization_code',
            code: nylasCode,
            redirect_uri: `http://localhost:8080/choosecalendar`,
          }),
        });

        const dataConnectToken = await response.json();
        console.log(dataConnectToken, 'dataConnectToken dataConnectToken')

```

And I’m getting this error. What could be the reason? I don’t have an account, and there are no matches with grantId either. Please help me resolve this.

```auto
{
    "error": "invalid_client",
    "error_code": 45003,
    "error_description": "Wrong client ID given",
    "error_uri": "https://developer.nylas.com/docs/v3/api-references/event-codes",
    "request_id": "5215060870-3db30d77-2fcb-4d85-a65d-d42a1ea6cf8c"
}, 'dataConnectToken dataConnectToken'

```

---

<div class="post-metadata">

### Author: ![ram](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.nylas.com/ram/32/3_2.png) [@ram](https://forums.nylas.com/u/ram)
#### Post date: [January 15, 2025, 6:38pm UTC](https://forums.nylas.com/t/error-45003-wrong-client-id-given-invalid-client/602/2 "2025-01-15T18:38:52Z")

</div>

@Kateryna - Thanks for posting, I just saw your other message, let me know if this is still an issue.