I'm always getting HTTP 40* when I hit any zapi api

I'm using Jira API token to hit all the zapi apis as mentioned in the link - https://support.smartbear.com/zephyr-squad-server/docs/api/how-to/create-tests.html

And, I'm using postman client. Any Jira is working properly, for e.g. https://xxxxx.atlassian.net/rest/api/latest/issue/TER-2

However, any request continaing zapi is throwing the error as below.

Request

https://xxxxx.atlassian.net/rest/zapi/latest/util/zephyrTestIssueType

Response