When adding, updating or replacing an SSL certificate you encounter the error "NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED"
This is most common with LetsEncrypt SSL as they seem to be overutilizing resources.
The issue happens when the LetsEncrypt servers are behind on pushing transparency proof logs and google chrome caches the cert info before those logs are in place. In most cases this will resolve itself within 5 minutes or so but may require you to close the browser and reopen it or even clear the cache on the affected browser. In some cases it can take much longer and may even require a reissue of the cert.