Why am I able to authenticate against REST API version2 and not against version3

Adam Gyõri

Good evening team, we have been using JIRA REST API version 2 for quite some time, specifically the request to fetch the USER:

https://globalwebindex.atlassian.net/rest/api/2/user/search?query="

We are trying to switch to version 3 using:
"https://globalwebindex.atlassian.net/rest/api/3/groupuserpicker?query="

For version 3 we are getting following response:
403 Forbidden
You are not authenticated. Authentication required to perform this operation.

We are using generated tokens via https://id.atlassian.com/manage-profile/security/api-tokens , then encoding the "email:token" string with BASE64. And creating request like:

curl -D- \

-X GET \

-H "Authorization: Basic encodedMailAndToken" \

-H "Content-Type: application/json" \

"https://globalwebindex.atlassian.net/rest/api/3/groupuserpicker?query=agyori@gwi.com&maxResults=50"

with response: You are not authenticated. Authentication required to perform this operation.

The thing I can not comprehend is why are we able to authenticate against version 2 and not against version 3. 

If you have any suggestion it would massively help us, thank you in advance.

Mikael Sandberg

You may want to to check the headers you are sending, based on the documentation the groupuserpicker is expecting Accept: application/json, not Content-Type.