Sorry, I don't want to turn this into a user support forum, but perhaps readers will be patient with me if it means we're confirming that we're not putting our secure data at risk.
I'm using chrome version 70. Per
this post to the google security blog, it is with the release of version 70 that certs issued by Symantec are no longer trusted. When I look at the details of the btn2go cert, it does appear to be a Symantec issued cert.
Would you be willing to share which browser and version you're using? And is the cert you're seeing for the site, one that's issued by Symantec? I'm trying to determine whether a 2nd person is having this issue. The btn csr I chatted with didn't seem too open to the possibility that their site has an issue.
[
update: This
2nd blog post seems to indicate not all users of chrome 70 will initially see the warning, so that could explain why others haven't reported.]