Collocations for envoy - noun

personal, special
senior, top
diplomatic, peace
papal, presidential, royal
UN
American, British, etc.

be, serve as
appoint (sb as)
The government has not yet appointed an envoy to the area.

dispatch, send
A special peace envoy was sent to the area.

envoy from
a special envoy from the American president

envoy to
He served as envoy to the French government.