This is a minor point, but it must not be overlooked.

此事虽小，然亦不可忽视。

《新英汉大辞典》

"It must not be trivialised," he said.

“千万不能行新视之”，他说。

youdao

It must not be allowed to do that this time.

这一次绝对不允许此类事情再次发生。

youdao

We must not be enemies. Though emotion may have damaged them, it must not break our ties of love."

VOA: special.2009.07.30

It must not be taken even if it's for the purposes of nourishment.

即使为了果腹，也不能引用。

耶鲁公开课 - 旧约导论课程节选

It must not be easy to write your own work.

你自己创作一定很难。

写作课程比较难 - SpeakingMax英语口语达人

Although a loosening of austerity is required, it must not be mistaken for the abandonment of austerity.

CNN: After the bailout, Spain needs to rise to the challenge

The converse of this of this is that if it does not look masculine, it must not be success.

FORBES: What If There's Nothing Wrong With Women?

When the IRA is inherited by the beneficiary, it must not be rolled over or moved to another institution.

FORBES: Options to Stretch an IRA Can Be Advantageous for Beneficiaries