The fact that

[SheltieCute]

"(The fact) that he never paid was surprising."
"Due to (the fact) that he never paid, the order was cancelled."

When is "the face" optional?

[JohnParis]

When is "the face" optional?

It is optional when your sentence construction does not require it, or when the phrase is verbose.
Remember, as you have been told elsewhere, 'Due to the fact that' is one of the phrases most despised by good writers. Avoid it at all cost."