acceptedFileTypes reject valid file types

I have this on a Fileupload:

->acceptedFileTypes(['application/json', 'json', 'application/msword', 'docx'])

->acceptedFileTypes(['application/json', 'json', 'application/msword', 'docx'])

->acceptedFileTypes(['application/json', 'json', 'application/msword', 'docx'])

->acceptedFileTypes(['application/json', 'json', 'application/msword', 'docx'])

I have tried this as well:

->acceptedFileTypes(['docx'])

->acceptedFileTypes(['docx'])

->acceptedFileTypes(['docx'])

->acceptedFileTypes(['docx'])

but when I select a .docx file I get an error saying: 'File of invalid type'