Problem with Guest Wifi Connection

[Android Central Question]

I can connect to Guest Wifi in work on my S7 not problem, but when I connect on my new Note 9 is comes up "Connection Not Private" - I've googled and done all the fixes they suggest but still won't work.

Wierdly when I look at the wifi settings on both devices they have different router addresses which I think may be the issue (security certificate hasn't been updated with new router address)?

Any ideas?