## Errors when connecting a list

The message in red comes from the check the app runs with your platform.

- **Invalid Mailchimp API key format (expected key-dcXX)**: copy the full Mailchimp key, including the dash and code at the end (such as "-us21").
- **Invalid Kit API key**, **Invalid API key** (MailerLite), **Invalid Flodesk API key.**, **Invalid Sendfox access token.**: the key was mistyped, revoked, or copied only in part. Create a new one and paste it again.
- **Invalid API key or publication ID** (Beehiiv): check both. The Publication ID starts with "pub_".
- **Invalid API key or list** (EmailOctopus): create a new key, then use **Find Lists** to pick the list.
- **Flodesk segment not found**: the segment was deleted or renamed in Flodesk. Click **Find Segments** and choose again.
- **Sendfox API requires a paid plan.**: Sendfox only offers API access on paid plans.
- **Brevo refused this key…**: paste the whole key, and make sure it was created with Contacts set to All and Email campaigns set to Read.
- **A Brevo list ID is a number, like 4.**: choose the list with **Find Lists** rather than typing it.
- **No audiences found in this account.** (or lists or segments): the key works, but the account has no lists yet. Create one in your platform first.

## Sendy errors

- **Enter a valid HTTPS installation URL**: the address must start with https:// and be your public Sendy address.
- **Blocked before reaching Sendy (HTTP …)**: something in front of Sendy, such as a firewall or security plugin, refused the request. Allow requests to the /api/ folder of your Sendy installation.
- **Sendy said: "…"**: Sendy answered with an error, usually about the API key or the List ID. Check both in Sendy.

## Sync problems

- **Only the account owner can sync newsletter integrations.**: collaborators can view lists but can't add or sync them. The data syncs when the owner opens the page.
- **Rate limit exceeded**: too many checks in a short time. Wait a minute and try again.
- **Subscription required**: connecting and syncing need an active trial or plan.

## Sync buttons are greyed out or say locked

If you see "Your credentials are encrypted. Enter your Master Recovery Key to sync integrations.", your saved keys are locked on this browser. Click **Enter Key →** and enter your Master Recovery Key. **Sync All** skips locked lists until then.

## "Couldn't decrypt the saved API key"

This means the recovery key stored in this browser doesn't match the one the API key was saved with. Entering the same recovery key again won't help. Either:

1. Click the pencil icon on the list, paste the API key again, and click **Save**, or
2. Replace the recovery key in **Settings** → **Security** with the one you used when you saved the list.

## My numbers look old

Check **Last synced** on the card. Lists refresh automatically only when the account owner opens Newsletter Analytics and the last sync is more than six hours old. Click **Sync Now** to refresh straight away.