Before 1949 Newfoundland was a separate country from Canada and both Newfoundland and Canada were "dominions". In Canada the status of a "dominion" meant that it was an independent country except that its constitution could be amended only by the British Parliament, and in particular it sent and received ambassadors. Did Newfoundland also send and receive ambassadors?
The Dominion of Newfoundland sent High Commissioners to the United Kingdom from 1918 to 1934 when the Dominion was abolished. It is of note that, unlike other Dominions of the United Kingdom including Canada, the United Kingdom did not send a High Commissioner to the Dominion of Newfoundland.