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"registration is mandatory" is correct and usable in written English.
You can use this sentence when you want to emphasize that it is necessary for someone to register for something. For example, "The registration process is mandatory if you would like to be a member of this organization."
Exact(24)
Registration is mandatory.
Seating is extremely limited and registration is mandatory for attendance.
Registration is mandatory to gain access to the Census Headquarters building in Suitland, MD.
Registration is mandatory, but there is no difference between the processes for hedge funds and mutual funds.
According to the International Committee of Medical Journal Editors (ICMJE), registration is mandatory for all prospective studies, comparative or not, that expose the subjects to a health-related intervention (i.e. surgical procedure or drug administration) and evaluate its outcome.
8– 10 Cancer registration is mandatory by law in both Norway and Denmark.
Similar(36)
We categorised journals according to whether trial registration was mandatory, encouraged (but not mandatory), or not mentioned.
Improvement of this registration system is mandatory before benchmarking of these findings in the public domain is appropriate.
Although consistent attendance is not mandatory, pre-registration is required.
Cancer registration in Sweden is mandatory, making ascertainment of incident cases virtually complete.
The main method to identify population-based controls was through the electoral roll, registration for which is mandatory in New Zealand.
More suggestions(14)
registration is obligatory
completion is mandatory
enrolment is mandatory
booking is mandatory
record is mandatory
registry is mandatory
registers is mandatory
registration is open
registration is necessary
registration is free
registration is above-average
registration is due
registration is available
registration is optional
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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