Unable to fetch DOS Attack data with F5 API

Hi

I am new to the F5 product and going through the BIGIQ Documentation. I have to get DOS attack data for all sites where F5 is deployed in my company and record the mitigation action that was taken. I run into authentication errors with the API. No luck going through the documentation ,API reference and community posts thus far. Any pointers will be greatly appreciated.

Please find attached snapshots.

Thanks

Akansha