how to disable skype for business pop ups

If I simply click on the green 'I have a Skype account' button, it takes me back to the previous login screen, a vicious circle.

However, since I don't have a Skype account, it took me to a Skype sign-in/sign-up screen:

I logged into Skype with the credentials. I managed to get into my user profile before the pop-up loaded, but the only option there was similar access to signing up. I also found advice online for modifying the Windows registry to remove Skype, but I use Linux, so that's not a help. I've found posts online describing a possible solution of removing or opting out of Skype integration from within an existing Skype account, but that requires creating an account. The pop-up options are sign-in or sign-up, and the 'continue' button signifies acceptance of terms. I don't have a Skype account, don't want a Skype account, and don't want to agree to any terms regarding a Skype account. I have been unable to block or bypass this pop-up: Starting a few days ago, I have been blocked from access to my email (via web access), by a pop-up that requires action on a Skype account. But I can't seem to locate a similar menu for settings anywhere.I have an old Hotmail account that Microsoft converted to an account. The only thing I've been able to find that comes anywhere close to addressing this issue is this. Is there a work around for this to get me back into Skype so I can communicate with the rest of my company? Nor have I done a repair install of O365/Skype for Business. Is there a registry setting to force my Skype to actually work as Skype and NOT forcibly redirect me to Teams? I have not resorted to uninstalling Teams at this point. Skype first opens, while signing in, and I can get to the condensed settings menu very briefly before this 'Teams' message appears. Everyone else is working in Skype fine but me. Funny thing is I'm the admin and have not migrated us to Teams. My Skype has been working fine until today when working from home when I open Skype and get a prompt that tells me 'Your Organization is now using Microsoft Teams'. We've rolled out O365 to a dozen or so people in the office and have not migrated over to using Teams.

We've just begun using O365 as we'd been using Office 2016 & Skype for Business 2015.

How to disable skype for business pop ups