Installing the trusted root certificate

Ref:https://docs.microsoft.com/en-us/skype-sdk/sdn/articles/installing-the-trusted-root-certificate

Adding certificate snap-ins

1. Launch MMC (mmc.exe).

2. Choose File > Add/Remove Snap-ins.

3. Choose Certificates, then choose Add.

4. Choose My user account.

5. Choose Add again and this time select Computer Account.

6. Move the new certificate from the Certificates-Current User > Trusted Root Certification Authorities into Certificates (Local Computer) > Trusted Root Certification Authorities.