Hello Flood, thank you for your feedback. With regards to your questions: I am running Kaspersky Internet Security app version 21.1.0.150a.b.c, with macOS Big Sur version 11.6 Yes the same on both Macs I haven’t added any exclusions as I wasn’t really sure what to add and didn’t want to mess it up without advice i Have the security extension but it is not enabled for safari or chrome Block website tracking is unchecked i am not using MS Teams through a browser, I am using the MS Teams application downloaded from MS365. It seems to work when accessing through the browser, but I have only tried this just now and it is a sporadic issue.