If it is like my usual experience with European academia, it may be intended to more heavily push use of Microsoft 365 services, which tend to somewhat assume phone availability. I think that usually universities cannot force the use of personal devices for work, so providing mobile phones on request is one way of moving to a more purely Microsoft service infrastructure. It looks like Radboud is a Microsoft shop, so I would not be surprised.

My university, for example, is gradually removing all office phones (already voip) and replacing them with Teams voip as the only phone system for the university, encouraging personal phone use of Teams, but having computer-based use as the option for people who refuse. As they don't provide mobile phones, however, they can't require Microsoft Authenticator, and so at least officially will still give hardware keys on request (and fortunately still allow TOTP, even if they don't advertise it).

There is a movement in Dutch academia to move away from Microsoft/Google services. E.g. SURF (the IT cooperative of Dutch education and research institutions) are extending their NextCloud pilot to all Dutch edu/research instututions:

https://tweakers.net/nieuws/241846/surf-biedt-opensource-nex...

Many individual universities are also making decisions to reduce dependence on US tech, see e.g.:

https://rug.my-meeting.nl/Documenten/Keuzevrijheid-IT-oploss...

(Apologies for the Dutch links.)