Vない-form なければならいません

Must…

it won't do if someone does not take some action
it'll be no good if you don't

Expressed in English as a positive statement.

MNN17-3

in spoken plain form
Vない-formなきゃ


Other References

https://www.mlcjapanese.co.jp/n4_01_16.html
https://youtu.be/esvB1cvv6AU