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Please stop saying mandate like it means something in this context. Or in fact could everyone just stop saying it all together.
Those MPs were voted in for a multitude of reasons, seeing as I don't recall any one of them setting out their case that if elected they would challenge JC's leadership then no explicit 'mandate' is given.
Their mandate probably includes being a good local MP, championing local issues, not being a Tory that kind of thing.
That 9 million was divided between, what 620-630 constituencies, (sorry don't know how many MPs are elected in Northern Ireland), so simple Maths suggests each individual MP received many fewer votes than Corbyn in either Leadership election.
Few MPs, these days, ever get 50,000 votes,
but I'm guessing in the '20s/'30s some Labour MPs in coal/steel/shipbuilding constituencies may have got 60-70,000 votes.