Error: unable to get local issuer certificate

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My question:
How can I set up the certificate correctly

Details (like screenshots):

I use Postman to send a GET request and it is blocked by the error: unable to get local issuer certificate.

image

How I found the problem:

I’ve already tried:

I have add client certificate in the settings > Certificates, following this document (Getting started ‒ Qlik Sense for developers) and this post (https://community.qlik.com/t5/Knowledge/How-to-configure-Postman-desktop-app-to-connect-to-Qlik-Sense/ta-p/1711499). I used a computer to visit the endpoint in an intranet. My computer is also in the same intranet.

I put the client certificate under Windows certificate store, Certificates - Current User>Personal>Certificates and root certificate under Certificates - Current User>Trusted Root Certification Authorities>Certificates. All these certificates are installed on both my client computer and the server I am going to access via API.

All these attempts cannot solve the problem. Can anyone help?