Prince Harry & Meghan's Archewell Foundation had $11M less in donations.
Foundation saw a major drop in contributions compared to last year.
Two $1M anonymous donations contrasted with prior $13M support.
Expenses exceeding $2.6M led to a $674,485 net revenue deficit.
Despite the setback, the foundation maintains around $8M in assets.
James Holt, the executive director, received a $170,000 salary increase.
Holt's total compensation was about $227,405, including a $20,000 bonus.
The couple, aged 39 and 42, don't draw salaries from the foundation.
The foundation made charitable donations totaling about $1.2M.
Archewell supported various initiatives, including mental health aid in Syria and Turkey.