First thing you will need You will need the .pem certification.
Next launch PowerShell as Administrator
We’ll be using the certutil.exe utility to import the certificate.
.\certutil.exe -addstore -f "Root" 'C:\Users\path\to\cert.pem'
Example output for importing a self signed UniFi certificate.
PS C:\Windows\system32> certutil.exe -addstore -f "Root" 'C:\Users\path\to\cert.pem' Root "Trusted Root Certification Authorities" Signature matches Public Key Certificate "unifi.local" added to store. CertUtil: -addstore command completed successfully. PS C:\Windows\system32>