End of season ranking: Masters

Does anyone know whether you need to be above 1900 MMR AND be rank 31-200 to get the end of season master’s reward chest? The in game tool tip says “Rank 31-200, 1900 on average”. Is rank 31-200 the only requirement or do you need 1900 MMR as well?

Hoping to get confirmation from a community advisor @Roxx @italianman

It just means that the Average MMR is 1900, for Rank 31-200.