Hello @MikeDuncan and welcome to the Community!
As a first troubleshooting step, the URL needs to be checked in order to identify the source of the potential threat.
You can submit the URL for our engineers to analyze here:
https://www.bitdefender.com/consumer/support/answer/29358/
Whitelisting the page can be achieved as well, if everything is safe.
Let us know if this helps.