Error returned when trying to invite users to the instance using the new UI

Summary

The below error is displayed when trying to invite users to the instance using the new User Management interface.

Steps to Reproduce

1. Invite a user to the instance

Expected Results

The user is invited with no issues

Actual Results

The below error message is displayed:

However, most of the times the user has actually been invited despite the above error

Notes

In the developer tools you can see that the request to https://INSTANCE/gateway/api/adminhub/um/site/CLOUD-ID/users/invite failing and:

• Sometimes it is is returning 400 (bad request) and the below response:

  {"key":"badRequest","context":{"message":"Licence exceeded","reason":"{jira-software=LicenseExceeded
  {available=0, needed=1}, conf=LicenseExceeded{available=0, needed=1}}"}}
  

• Some other times it returns error 500 and the below response:

  {"timestamp":"2018-12-13T16:29:02.654+0000","status":500,"error":"Internal Server Error","exception":"com.netflix.zuul.exception.ZuulException","message":"GENERAL"}
  

Workaround

Contact Atlassian Support to have the new UI for UM disabled.