Multiple browsers/dev only signed into one. 2 step verification enabled but not being asked for code

I'm not questioning your reading skills or anything but since you failed to read the body of my post Im inquiring about the possible use of physical security keys -or better known as 2FA-keys to better secure my account. If you don't know what I'm talking about why don't you look it up. Search Yubico or Google key. For thiey are far more reliable than sms or email for two step authentication . If you know anything about security you should be aware about how highly insecure sms is and emails can be hijacked, compromised and sometimes unrecoverable. Secondly why does it show on some days one current session and others times when I sign in there will be multiple sessions. IWhen I'm only using one browser and one laptop, In the picture you can see different browsers andmy  laptop device name. I'm just concerned some unathorized user is using or hijacking my sessions to login to my account  by bypassing 2FA. I went ahead and deactivated sms and I'm using Adobe access on my phone to better secure the account for now. It adobe cares about its customer security at all they should implement the keys. I really  don't see why they wouldn't.