You are right on or over the Microsoft licence limit of 5 devices per login. https://learn.microsoft.com/en-nz/microsoft-365/commerce/licenses/subscriptions-and-licenses?view=o365-worldwide#how-many-devices-can-people-install-microsoft-365-on "If your subscription includes any of the following products, each person can install Microsoft 365 on up to five PCs or Mac, five tablets, and five phones." I wouldn't use this approach because if it isn't already broken, if they get even slightly more devices the approach will fail. I suspect it only works now because they do a new sign-in every time - so they don't have to rely on devices remaining signed in. If you pre-sign them in it may well fail. And there there is the legal and moral issue. They are in violation of their Microsoft licence agreement. Every individual user requires their own licence. It sounds like they are paying for 6 licences when they require a licence for every student (it is the student that needs the licence, not the device).
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