xmpp.zoom.us certificate not trusted

Since today I have had a pop up window saying that it is not possible to stablish a safe connection with zoom . If I click on " open certificate " it appears the following" DigiCert Global G2 TLS RSA SHA256 2020 CA1 "error code 1: xmpp.zoom.us. The Certificate from DigiCert Global G2 TLS RSA SHA256 2020 CA1 is not safe"

I am scared. Tried different networks, different clients, no effect.

Please help!