When creating People in Webex using the API, below  an error occursFailed to create people. The domain of the user does not match any of your verified or claimed domains. Hence, you cannot claim this user into your organization.Why this error occurs?

Is it possible to assign an extension to a user without a phone number?If yes, how can an extension be assigned to a user without any number?

When get below error in Hunt Group API"errorCode": 25055,"message": "INVALID_COUNTRY_CODE. Missing or invalid default region.", Body request {    "name": "xxxxxxxxxx",    "phoneNumber": "xxxxxxxxxx",    "extension": "xxxx",    "firstName": "Hakim",  ...

if create more then 500 location in but when i use https://developer.webex.com/docs/api/v1/locations/list-locations this but only 500 location.what solution for get more then 500 location?