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The phrase "had previously failed" is correct and usable in written English.
It can be used to indicate that something was unsuccessful in the past before a certain point in time.
Example: "The project had previously failed due to lack of funding, but we are optimistic about the new proposal."
Alternatives: "had earlier failed" or "had failed before".
Exact(60)
It had previously failed an inspection in November 2012 for failing to complete hourly observations, state records show.
Risperidone may be efficacious in many patients who had previously failed antipsychotic trials.
Hill had previously failed in an attempt at desegregating Georgia State Coll.
What the violent militants had previously failed to achieve, one drone strike accomplished in an instant.
But the chamber of novice lawmakers had previously failed to reach an agreement.
Rodman said insurgent efforts to derail the political process, which he called "the strategic prize," had previously failed.
This approach succeeded in crossing boundaries where political policy, social strategy, policing and corruption had previously failed.
Disappointed, the radicals closed ranks behind Jalili, who had previously failed to attract an endorsement from any principlist faction.
Following Armani's surprise declaration, there was speculation that the new-look CNMI might succeed where it had previously failed.
Solanezumab had previously failed in two large clinical trials involving patients with mild or moderate Alzheimer's disease.
He eventually triumphed, where Sam Fox and Sinitta had previously failed, winning that once in a lifetime, career-altering chance to represent the UK.
More suggestions(15)
had originally failed
had prior failed
had previously ignored
had previously accomplished
had ever failed
had previously withdrawn
had previously eliminated
had historically failed
had previously fallen
had previously filled
had once failed
had recently failed
had hitherto failed
had previously provided
had already failed
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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