Can I delete my default organization?

Symptoms:

• I have created several organizations and now I want to delete the default organization
• I tried to delete my default Unity organization, but I got an error. 

Resolution:

It is not possible to delete your default organization. This is a restriction set by Unity for security and account integrity reasons.

If you want to reduce the number of organizations in your Unity ID account, you can use the following workaround: 

1. Rename the default organization to something more appropriate for your needs.
2. Transfer projects and assets from other organizations to your default organization by following the articles below:

How do I transfer an Asset Store purchase from one account to another?
How do I transfer my Project to a different Unity Organization?

Once these steps are complete, you can delete any other extra organizations you no longer need.

More information:

How do I rename my Organization?

How do I leave an Organization?