CLI - cannot use my own domain in setting up OAuth flow

**Describe the bug**
While creating an Auth category I'm doing the full walkthrough.
When I try to add my own domain I get an error.

```
>> The value must be a valid domain name format. A valid format consists of lowercase alphanumeric characters or hyphens. Hyphens cannot be at the beginning or end of the string. The domain cannot use th
e reserved words 'aws', 'amazon', or 'cognito'.
```

I have certificate for my own domain and everything.
**To Reproduce**
Run the wizard and in the step:
` What domain name prefix do you want to use?`
Type your own. I typed: `auth-dev..com`

**Expected behavior**
To pass this step and have the domain created in aws-exports.

**Screenshots**
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