I gather it won’t happen everywhere but certainly happens at our end (and most companies I work with); but we employ an accounts lady who handles all purchase ledger invoicing (buying a pen, paying for the supply of gas or electricity but also for Office365 or AWS) which is mostly done via our business partners portals.
So basically one (free of charge) account should be made available per company that strictly covers administrative duties limited to Atera subscriptions and licensing, add and remove agents’ licences, edit payment details such as credit card details, invoices, etc.