Board Thread:Questions and Answers/@comment-35300388-20180414015408/@comment-34793647-20180414180102

Happened to me twice, on different phones, 1st time removed facebook app from phone and worked. 2nd time was transferring from old phone to new phone, i had to go to on old phone and unlink dokkan account from facebook 1st.

No idea if will work in your case, hope you figure it out.