Go to Settings → General
Click on the "+" icon in domains
Enter the domain and an email with that domain
Enter the code sent to that email
Add domain to your workspace
Add another domain to the workspace to add other members from outside your domain
Add another domain to the workspace to add other members from outside your domain
Go to Settings → General
Click on the "+" icon in domains
Enter the domain and an email with that domain
Enter the code sent to that email