At work we have Windows licenses but we also use kmspico (A "crack" for Windows in that it just runs a local activation server to activate against).
We do this for three reasons:
1) In the UK, it is perfectly legal to do this if we own the license and "coz we can".
2) Our workstations must stay deterministic. No sloppy crap passed down to us from the chaos that is Microsoft in 2019.
3) Some of our projects are quite sensitive and therefore machines are offline for the entirety of their lifespan and using a phone for licensing is quite obsolete.
I recommend everyone doing the same. I think it is mad that people expose themselves to the fallicy that is online DRM.