1. Delete the Assets\WSATestCertificate.pfx certificate file.
2. Find Certificate under Publishing Settings in Player Settings and select a valid certificate.
3. If there is no other valid certificate, you need to generate a new test certificate:
- Windows: MakeCert.exe -r -pe -n "CN=Temporary Certificate" -ss MY -len 2048 -cy authority TemporaryCertificate.cer
- Mac: openssl req -newkey rsa:2048 -nodes -keyout TemporaryKey.pem -x509 -days 362 -out TemporaryCertificate.pem
4. Import the new certificate generated and select it in the Certificate option of Player Settings.
5. Rebuild the UWP project.
