When trying to install the extension from https://authenticator.cc/ a sever security warning pops up chrome

[ouboub]

Hi
Using Ubuntu 24.04 and either

1. google-chrome 147.0.7727.101-1
2. chromium-browser 147.0.7727.55

Then, install the extension from https://authenticator.cc/

I receive
Your connection is not private
Attackers might be trying to steal your information from kutt.otp.ee (for example, passwords, messages, or credit cards). Learn more about this warning
net::ERR_CERT_COMMON_NAME_INVALID

That looks strange. Any comments?

Uwe Brauer