IP completely blocked by domain zoom.us but NOT in any spam list or blacklist worldwide

Hi,

I own a fixed IP address at the office given by my ISP (Movistar) the IP address is 80.28.235.27 If I open a browser from that IP to https://zoom.us it is directly blocked. But if I change my IP and use dynamic IP of sharing phone internet connection everything is fine. For some unknown reason that IP is blocked.

It is interesting to mention that the IP is NOT in any blacklist and has never been used for spam. Also, it is blocked since more than a month now (maybe since ever?)

So, we cannot use zoom.us services from the office

Hope someone from zoom can take a look at the reason for this!

Regards (from my phone connection)

Ignacio