A quick duckduckgo search and there are plenty of causes of project failure:
The inevitable "top 10" reasons … https://project-management.com/top-10-reasons-why-projects-fail/
7 reasons … https://www.pmi.org/learning/library/seven-causes-project-failure-initiate-recovery-7195
6 reasons … https://www.coleyconsulting.co.uk/failure.htm
3 reasons … https://www.villanovau.com/resources/project-management/why-projects-fail-how-to-avoid-them/
and a massive, gold start winning, 101 reasons … calleam.com/WTPF/?page_id=2338
Why is yours going to fail, or already failing, and what are you going to do about it?