Are you able to get any other PUT/POST requests to work on other endpoints? Possibly the content-type is not set to “multipart/form-data”?
I was able to get it to work with this curl request:
curl -X PUT "https://url/t/topic-title/17/status" \
-H "Content-Type: multipart/form-data;" \
-F "api_key=apikey" \
-F "api_username=username" \
-F "status=visible" \
-F "enabled=false"