Power BI Admin Portal - Can't Add Groups to Workspaces

Thanks for the response.  In our case we can't use the API, and that's only a workaround for broken functionality.  We're posting this here to get Microsoft's attention on it, and hopefully get these issues fixed.  We've experienced a number of issues with administratoring this environment (constantly hitting API limits with PowerShell calls, even with minutes of sleep statements, the Newtonsoft.JSON Power BI PowerShell issue, amongst others).  We've put in a couple of cases, but it doesn't seem to get the Product Teams attention on how buggy its been.