dotnet dev-certs certificate not trusted

I am working through Adam Freeman's book "Pro ASP.Net Core 3". I have gotten to the introduction to https. He instructs us to use Powershell and run these commands in this order

dotnet dev-certs https --cleandotnet dev-certs https --trust

When I run the clean command, I get a message saying

"HTTPS development certificates successfully removed from the machine."

But when I run the trust command, I get:

"A valid HTTPS certificate with a key accessible across securitypartitions was not found. The following command will run to fix it:'sudo security set-key-partition-list -D localhost -Sunsigned:,teamid:UBF8T346G9'This command will make the certificate key accessible across securitypartitions and might prompt you for your password. For moreinformation see: https://aka.ms/aspnetcore/2.1/troubleshootcertissues

A valid HTTPS certificate with a key accessible across securitypartitions was not found. The following command will run to fix it:'sudo security set-key-partition-list -D localhost -Sunsigned:,teamid:UBF8T346G9'This command will make the certificate key accessible across securitypartitions and might prompt you for your password. For more informationsee: https://aka.ms/aspnetcore/3.1/troubleshootcertissues

Trusting the HTTPS development certificate was requested. Aconfirmation prompt will be displayed if the certificate was notpreviously trusted. Click yes on the prompt to trust the certificate.There was an error trusting HTTPS developer certificate."

I tried

• running dotnet dev-certs https results in "A valid HTTPS certificate is already present."
• running powershell as administrator. But I got the same errors. The book says I may get a couple of dialog boxes, but I did not get them.
• dotnet --version gives me 3.1.200.

What do I have to do to get the certificate to work?