Active users and active learners for one of the partner's accounts, one entry per calendar month from from to to (inclusive, at most 24 months, to defaults to from, and a month in the future is refused). An active user is a user whose status was active at any point in the month. An active learner is an active user who also had at least one learning assigned and not completed at any point in the month. SuperPath staff are never counted, and months run in the account's timezone. A closed month's figures never change; the current month is flagged provisional until it ends. Responds with { tenantId, timezone, definitionsVersion, asOf, availableFrom, months } where each month carries { month, periodStart, periodEnd, provisional, beforeAccountCreated, activeUsers, activeLearners, activeLearnersBreakdown: { carriedOver, newThisMonth } }.