I have the same issue. And the Support pages don't help because they just send me in a loop.
I choose the "I'm having trouble logging in and I know my password" option and it directs me to contact support. The options for contacting support direct me to log in to be able to contact support........
I also have the same issue on my computer. Any news from Lastpass? I don't know how to contact them!
I can share that happening on my mac in Safari but both Chrome and Firefox are working. I also have a ticket into Support and have narrowed it down to my Safari browser on desktop. Weirdly Safari accepts my login on tablet and iphone.
I am having the same issue too. I tried to use LastPass on Safari on my Macbook Air and doesn't work but if I use Chrome on a Windows laptop does work.