2FA options that don't include cell phones

Location: Europe

My company wants to enforce 2FA via cell phone- even though this is our private property. Legally speaking it's dodgy but non-refutable. I can either choose to suck it up or not be allowed to work from home.

I want to present some alternatives to microsoft authenticator that are same in price range and use either mail or another way -I'm keeping all options open.

What would you suggest?