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I can't authorize the plugin: 'This app has reached its user limit'

Problem

When trying to authorize the plugin with your own custom Dropbox app, you get an error message:

"This app has reached its user limit."

Cause

When you create your own Dropbox app, it starts in development mode. In this mode the app has a low limit on how many user accounts and domains can connect to it. Once you hit that limit, additional users can't authorize.

Solution

You have two options.

Option 1: Raise the user limit on your custom app

You don't need to apply for production approval. You can raise the limit directly:

  1. Sign in at the Dropbox App Console.
  2. Open your custom app.
  3. Click Enable additional users (or the equivalent option to raise the development user limit).

Option 2: Switch back to the plugin's default app

If you don't need a custom app, you can switch back to the plugin's default app:

  1. Open the plugin's settings page in WordPress.
  2. Remove the App Key and App Secret values.
  3. Save.

The plugin will then use its built-in default app.