.net core web api app doesn't work when run locally - unable to verify first certificate

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A fellow developer created a Web API .NET Core 2.2 solution that is being hosted on Azure. He is able to run it fine locally on his machine (the machine it was created on). We are using https for the web api calls. I am also using Visual Studio 2019 Community Edition.
The web api work when we publish to Azure.

The problem is when I try to run it locally on my machine the web apis do not work. Looking at it with Postman I get this:

Error: unable to verify first certificate.

So it is obviously a certification error. I have done a few searches and found a few pages that walked you through creating a certificate but I haven't had any success so far with them.

So I am stuck and help would be most appreciated.

Some of the sites I have gone to are:

https://medium.com/@the.green.man/set-up-https-on-local-with-net-core-and-docker-7a41f030fc76 https://www.hanselman.com/blog/DevelopingLocallyWithASPNETCoreUnderHTTPSSSLAndSelfSignedCerts.aspx ASP.NET Core + IIS Express how to setup SSL Certificate

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