Issue Summary

Not able to remove any recent user added to the site from a group using the DELETE method of the API /rest/api/3/group/user.

Steps to Reproduce

1. Invite any new user to the site
2. Add the user to any existing group
3. Try to delete the user from the group using API
   curl --request DELETE --url ‘https://<site name>.atlassian.net/rest/api/3/group/user?groupname=<group name>&accountId=<said>’

Expected Results

User should be removed from the group

Actual Results

The below exception is thrown in the console

"errorMessages":["An error occurred: com.atlassian.idp.client.exceptions.UserNotFoundException: {\"schemas\":[\"urn:ietf:params:scim:api:messages:2.0:Error\"],\"status\":\"404\",\"detail\":\"A user with ug:<random-numner> doesn't exists\",\"errorType\":\"UserDoesNotExist\",\"message\":\"A user with ug:4c56a3de-54bf-4e38-9e9b-664738f439d6 doesn't exists\",\"data\":\"ug:4c56a3de-54bf-4e38-9e9b-664738f439d6\"}"],"errors":{}}%  
...

Workaround

Users could only be removed from the group using the user management page.