The phrase "actually mandatory" is correct and usable in written English.
It can be used to emphasize that something is required or obligatory, often in contrast to a previous assumption or statement.
Example: "While some tasks may seem optional, the safety training is actually mandatory for all employees."
Alternatives: "truly required" or "genuinely obligatory".
I would love to implement the Australian model in America, but I recognize that mandatory voting — actually, mandatory anything — is a hard sell in this country.
You might argue that observing Constitution Day is not actually mandatory because the schools have a choice: if they believe that observing Constitution Day is a violation of their autonomy, they can refuse federal money.
The ICC's relatively hands-off approach is not working: only in Australia is it actually mandatory for players in official matches to wear helmets that adhere with the safety standard.
Along with James Beard and Julia Child, the other two of what the writer David Kamp calls "the big three" in his book "The United States of Arugula," Claiborne made it not just acceptable but exciting — actually, mandatory — for home cooks and amateur eaters to concoct and swap notes about culinary rapture.
The Cluster mission, with its four spacecraft, has been designed to disentangle as much as possible this spatio-temporal ambiguity, which is actually mandatory for characterizing the space turbulence, especially whenever the spectrum involves an unknown Doppler effect and when it cannot be assumed to be isotropic.
He frequently implies that jurisdictions are required to detain people at the Department of Homeland Security's request, although their cooperation is not actually mandatory.
He unveils doctrines that have nothing to do with how he actually behaves: "Mandatory education is a coercive education that suppresses freedom.
Section 78 of the Equal Pay Act, calling for public transparency around employee earnings, actually became mandatory pre-election, triggering a considerable backlash from businesses and some sections of the Tory party.
Or, in the case of the latest push to reform Wall Street, the devil is in whether or not the details will actually be mandatory.
9f, 24 Experiments in the absence of Ag2O suggested that the silver salt is actually not mandatory, although it facilitates this oxidation step (Table 1, entries 15 and 16).
Dayne is unhappy with his playing time and is boycotting the off-season workouts, which are officially voluntary but are actually all but mandatory.
