It’s explained in the article.

Thank you for your response Tony.
Yes I’m trying to fetch specific user’s data for a project. Can you please explain the application permission thing as I’m new to it or you may refer to some post or blog.

Are you trying to access someone else’s account? If so, you need application permission, not the delegated permission assigned by default.

Given that I can’t see what’s happening in your tenant, you should file a support call with Microsoft and have them check things out.

Thanks, Tony for your quick responses, yes initially I thought so, but this user can delete dataset where it has no access.

https://learn.microsoft.com/en-us/powershell/module/microsoftpowerbimgmt.profile/invoke-powerbirestmethod?view=powerbi-ps documents the cmdlet as a helper function to run a BI command using the signed-in profile. That sounds like the account is able to work with the data they have access to and is able to delete a dataset. Have you tried to run the cmdlet and attempt to delete a dataset that the user can’t access?

If user can run below command,
Invoke-PowerBIRestMethod -Url ‘groups/{groupid}/datasets/{datasetid}’ -Method DELETE, which means a user got the permission scope – Dataset.ReadWrite.All.

So, if I want to know, who all users can do this.

What do you mean API permissions a user has?