Experiencing Certificate Connection Error

I am with a restricted (company) club. Today two members encountered the same error: "Your connection isn't private. Attackers might be trying to steal your information from 1739738.toastmastersclubs.org (for example, passwords, messages, or credit cards). NET::ERR_CERT_AUTHORITY_INVALID

This server couldn't prove that it's 1739738.toastmastersclubs.org; its security certificate is not trusted by your computer's operating system. This may be caused by a misconfiguration or an attacker intercepting your connection."

On Chrome I was able to "Continue to 1739738.toastmastersclubs.org (unsafe)" but not using Edge.
Couldn't see the certificate.  Today is the first day of the month. Could the certificate expired?

1) Clear your cache the certificate was updated today.

2) make sure your browser software is up-to-date.

3) if you are using windows make sure your windows is up-to-date.

Echoing tasnyder's issue, I am also with a restricted (company) club and am encountering the exact same issue in Edge. Over 10 members of our club have experienced this issue as well. Edge is the preferred browser of our company, thus we cannot resort to Google Chrome or other browser options.

I've cleared my cache and confirmed that both Edge and Windows are up-to-date, yet I'm still experiencing this invalid certificate issue. Is there something additional that can be done on my end?

I'm experiencing the same issue as tasnyder. Also part of a restricted (company) club, myself and at least 10 members of our club have experienced the same invalid certificate issue. I've cleared my cache and kept my browser (Edge) and Windows up-to-date, but still experience the same issue. Edge is the preferred browser of our organization, thus we cannot resort to Chrome or another alternative.

Is there something that needs to be done at a higher level to remediate this issue? Or are there other methods you suggest?

I am also with a corporate club, using MS Edge, under a tightly managed security environment. All of my club members are experiencing this issue. 

True Blue 8159

This appears to be the same issue we ran into almost exactly a year ago with this certificate. Here is the thread where we discussed this. I checked it with SSL Certificate Checker - Diagnostic Tool | DigiCert.com  and it says "TLS Certificate is not trusted." 

FreeToastHost 3 - "Your Connection isn't private" - [FreeToastHost Forum] (toastmastersclubs.org)