Unlike nearly the whole of Azure for some inexplicable reason to just administrate Universal Printing the account must have a licence for UP. Please remove this requirement but by all means prevent the account from using the service normally - why is a licence needed?
We have a corporate policy that all Azure admin accounts are separate to any user account i.e. as Global Admin I have my day to day account and my separate Azure admin account for performing administration in Azure/M365. We do not allow these accounts to have any licences as they should not be used for any other purpose, not even an Exchange licence.