Authorization URL - TechDirect API in Power Automate

I apologize if I'm not posting this in the correct location. I am working with the Dell Warranty API and have everything working perfectly in Postman, but Microsoft Power Automate wants an authorization URL if I set the Authentication Type as OAuth2.

I believe this wants me to sign into a website with my dell credentials, but I'm not sure what to put for the authorization URL. Any ideas?