I'm Canadian and in Canada for what it's worth. Clicking on the lock tells me that it was verified by lets encrypt. The root is "Digital Signature Trust Co." Common Name "DST Root CA X3".

Cisco sounds like a router might by running a MITM on you?

Edit: This looks to be confirmation that that root (or one by a very similar name) is used by a MITM tool:

https://docs.umbrella.com/deployment-umbrella/docs/rebrand-c...

Thanks for the diagnosis. Accessed from a different network and with no issues. And got the right certificate this time.