Mark E. Petersen disputes the authenticity of the 1886 John Taylor revelation.
Mark E. Petersen, The Way of the Master (Salt Lake City: Bookcraft, 1974), 57
To justify their own rebellion recalcitrant brethren devised a scheme which they hoped would frustrate the stand of the Church on plural marriage. They concocted a false revelation, allegedly given to President John Taylor in 1886, in which pretended secret authority was given to continue plural marriages.
On June 17, 1933, the First Presidency, under President Heber J. Grant, issued the following statement pertaining to this false revelation (italics have been added):
[Reprint of the 1933 First Presidency statement]