Self-signed certificate in certificate chain…

Trying to log onto WPMUdev from the dashboard in a website running in a local environment on my PC (using Flywheel Local) won’t work:

Your server had a problem connecting to WPMU DEV: “cURL error 60: SSL certificate problem: self signed certificate in certificate chain”. Please try again.

Even with a bit of searching and reading, I can’t get an understanding of what the problem is so I am finding it difficult to solve without knowledge.