I’ve got the same issue, sounds like Norton 360 is mistakenly flagging the Yubico Authenticator app as a security threat and quarantining it. Is this a false positive?
"Hi there! Thank you for letting us know. We are aware that some anti-virus software flags the app as a false positive. We are in contact with the AV vendors to try to resolve this
We have confirmed the application available in the MacOS direct download is consistent with the one posted on our website and Yubico Authenticator’s GitHub repository. Based on our investigation and the report provided in your submission as well as details in VirusTotal, the detection is a false positive. While we cannot prevent false positives, we can alert security vendors when such detections occur and ask them to prevent a particular file from being flagged in the future. Using the information you provided to us, we have submitted a false positive report to avoid detecting the software as malicious in the future. If you have any outstanding concerns, please let us know.