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I get an 'Invalid client' error when authorizing the plugin

Problem

When you try to authorize a cloud account in the plugin, the connection fails with an "Invalid client" error. The exact wording depends on the cloud provider, for example:

  • Google Drive: 401 Invalid_client
  • OneDrive / SharePoint: AADSTS70002 or similar Microsoft authentication error mentioning "invalid client"
  • Dropbox: error referencing an invalid app key or client
  • Box: error referencing an unauthorized or invalid client
  • NextCloud / ownCloud (Synkivo): OAuth error referencing an invalid client or unauthorized client

Cause

There are two common causes.

1. Custom app misconfiguration

You registered your own app with the cloud provider (Google Cloud Console, Microsoft Entra / Azure, Dropbox App Console, or Box Developer Console) and configured the plugin to use it, but one or more of the OAuth credentials or settings is incorrect.

2. Plugin or license issue (when using the default app)

You're using the plugin's default app (no custom App Key or Client ID configured in the plugin settings) and still get the error. This usually points to a problem with the plugin itself or its license validation.

Solution

If you're using the default app

  1. Update the plugin to the latest version through your WordPress Updates dashboard.
  2. If you're already on the latest version, go to the plugin's license screen in your WordPress dashboard and deactivate the license, then activate it again with your license key.
  3. Try authorizing the cloud account again.

If the error persists after both steps, contact our support with a screenshot of the exact error message.

 

If you're using a custom app

Review your configuration:

  • Double-check the Client ID and Client Secret (or App Key and App Secret) you pasted into the plugin's settings against the values shown in your provider's developer console. Watch for trailing spaces.
  • Make sure the OAuth consent screen or app details are fully filled in at the provider's side (app name, support email, scopes).
  • Make sure the redirect URI registered at the provider matches the one shown by the plugin.

If you'd rather not maintain your own app, you can switch back to the plugin's default app by removing the Client ID and Client Secret from the plugin's settings page and saving.