Hi @Dinesh
You can review the API calls for Confluence users at https://developer.atlassian.com/cloud/confluence/rest/api-group-users/#api-group-users
You will notice there is not a API in that set that returns a list of users for this you need to think laterally and use the groups of members. Assuming you have used the default group confluence-users this will provide you with a list of all users and the API to get this is described at https://developer.atlassian.com/cloud/confluence/rest/api-group-group/#api-wiki-rest-api-group-groupname-get. Notice that get group members is deprecated and replaced with get group.
Phill
If you are getting a 404 error that sounds like you are not calling the correct url with the correct authentication. I would go back to a simpler API call and check that is working first before moving on to one with multiple parameters.
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