Ok that looks like a chrome generated dialogue.
The easiest way to deal with a dialogue like this is to just put the username and password in the url.
If your url is https://your.host.name/path it becomes https://username:password@your.host.name/path, then the dialogue shouldn’t appear and you should get logged in.
If that doesn’t work then perhaps one of these threads will help
- SecureAuth Sign In pop up. How to handle
- Handle Authentication Popup using Selenium Library in Robot Framework
Dave.