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Discover Ludwig"was mandatory" is correct and usable in written English.
You can use it when you want to express that something was compulsory or required. For example: "Attendance at the meeting was mandatory for all employees."
Dictionary
was mandatory
adjective
Obligatory; required or commanded by authority.
synonyms
Exact(60)
Attendance was mandatory.
Dressing up was mandatory.
Nonetheless, participation was mandatory.
Bruce's meeting was mandatory.
But financial reform was mandatory.
Several suggested the fee was mandatory.
Doyle said Powell was unaware that the camp was mandatory.
But attendance at these family dinners was mandatory.
For decades, part of the reason was mandatory arbitration.
Until 1980, Dr. Lev said, smallpox vaccination was mandatory.
At issue is whether the training camp was mandatory.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com