Why this metric earns trust
Every other line in a QBR can be read as the MSP defending its own service. Unused licences is the MSP finding money the client is spending for nothing. It costs the MSP margin in some cases, which is exactly why clients remember it.
It is also simple to count and simple to act on, which makes it a reliable source of a decision with an owner in a quarter where the other metrics are flat.
Define unused before counting
The count depends entirely on the definition, so settle it once. No sign-in for thirty days is a common line for productivity suites; ninety days suits tools with seasonal use. Assigned to a disabled account is unused by any definition. Write the rule in the data dictionary and keep it constant.
Count seats, not products. Fourteen unused seats across three products is a number a client can act on; three underused products is not.
Where the licence lives matters for the count too. Microsoft 365 and Google Workspace report last sign-in directly; line-of-business tools often do not, and for those a named-user list reconciled against the active directory is the honest source. Say which method produced the number, because a client who reclaims a seat and finds it in use next week stops trusting the line.
What to put on the page
The count this period, the count last period, and the direction. If the number fell because the client acted on last quarter's recommendation, say so: it is the clearest evidence in the document that the review produces outcomes.
Leave the currency to the client. A dollar figure on the page assumes a per-seat price the client can dispute, and a disputed figure undermines the finding. The count is unarguable; the client can multiply.
The decision request
Reclaim or reassign the seats, owner named, date set. If reclaiming reduces the MSP's own resale margin, say that too. A client who sees the MSP recommend against its own interest reads every other recommendation on the page more generously.
Next quarter, close the loop
The second time the line appears is where it earns its keep. If the count fell, the page shows a recommendation the client acted on and a result they can see. If it did not fall, the page shows a decision that was agreed and not carried out, which is a more useful conversation than a new finding.
Either way, keep the definition constant and keep counting. A licence position tracked for four quarters is a small piece of evidence that the review changes things, and that is the argument for the review itself.