You can authenticate to VMware Cloud on AWS by using a refresh token.
You can obtain a refresh token from your VMware Cloud on AWS user profile under the Access Tokens area, or from the VMware Cloud on AWS administrators in your organization. After you receive a refresh token, you can provide it to DCLI when prompted. DCLI prompts for a refresh token when you try to access VMware Cloud on AWS.
./dcli +vmc +i Refresh Token:
The refresh token is provided in a secure way. Be careful that you are using the copy/paste functionality of your terminal correctly to avoid pasting the refresh token more than once. After you provide the refresh token, DCLI asks whether you want to save it to the credential store. If you choose to save the refresh token, you will not need to provide it each time you connect to VMware Cloud on AWS.