https://api.powerbi.com/v1.0/myorg/' (404): Not Found Get Activity Events

Hi GhelPlus 

First, you need to make sure you have the following required permissions and scopes, and check if you hit any of following limitations.

After check the above info are OK, please try to update the API with the parameters. In the ActivityEvents REST API call, you must specify a start date and end date and optionally a filter to select activities by activity type or user ID. Because the activity log could contain a large amount of data, the ActivityEvents API currently only supports downloading up to one day of data per request. In other words, the start date and end date must specify the same day, as in the following example. Make sure you specify the DateTime values in UTC format. You can get the details from the following documentation:

ActivityEvents REST API

https://api.powerbi.com/v1.0/myorg/admin/activityevents?startDateTime='2021-12-21T00:00:00'&endDateTime='2021-12-21T23:59:59'

Finally, check out the solution in the following thread with similar problem to yours, and hopefully it will solve your problem as well.

Error accessing Power BI REST API: Admin - Get Activity Events using Service Principal auth

we had the same issue and after investigations with MS support we found out that the Admin Consent should be removed from the app permissions.  Once removed the 

PowerBINotAuthorizedException

error was gone ! 

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Best Regards

Lucien