Separate 'minimum' from 'incomplete'
A minimum viable product should still solve the core problem completely for a narrow use case, rather than solving a broad use case partially. Scope by narrowing the audience, not by shipping a half-working feature set.
Decide early on tenancy and data isolation
Multi-tenancy strategy is one of the more expensive decisions to change after launch. Even an MVP benefits from an explicit, documented decision on how tenant data will be isolated.
Instrument from day one
Basic usage analytics from the first release make it far easier to make informed product decisions after launch, rather than guessing at what users actually do.