The phrase "a message on what" is not correct and sounds incomplete in written English.
It can be used when referring to a message that provides information or clarification about a specific topic, but it typically requires additional context to be clear.
Example: "I received a message on what we need to prepare for the meeting next week."
Alternatives: "a message regarding" or "a message about".
Lowe sent him a message on what appeared to be a dormant Facebook account; to her surprise, she heard from him the next day, while at a Glasgow museum with her family.
A message on what appears to be Casey's MySpace page, updated Tuesday, lists his mood as "blah" and has the message, "ME AND JAMIE ARE OVER..... :(". Here is a picture of the couple a year and a half ago, when they were already serious. Aldridge is supposedly in college in Mississippi.
Visually attractive, well shot and dynamically edited, this ten-minute broadcast talks about the issue in an attractive way, clearly points to the hazards of on-line abuse and exploitation and sends a message on what should be paid attention to in school, at home, among children, and among adults.
However, by drawing up recommendations on agreements such as TTIP, Parliament sends a message on what it wants to see in the final agreement.
Infrastructure has stalled in Congress over funding, but lobbyists say some of the blame also falls on the White House, which lacks a clear message on what Trump wants.
The European Union, reluctant to embrace new members saddled with old quarrels, has yet to send a clear message on what it thinks about the Status Law.
By implementing currently non-standard features on their homepage, Google are sending out a strong message on what they believe the new standard features should be, and not coincidently, it is the features that their own browser implements and supports.
Philadelphia Eagles safety Malcolm Jenkins used silence and signs to deliver a strong message on what the protests by NFL players are really all about.
Three minutes before the attack, he posted a concerning message on what appears to be his Facebook page, which was taken down Monday.
In his 16th and final State of the State address, Gov. Jerry Brown largely pivoted away from familiar warnings about California's future to instead offer a valedictory message on what's been accomplished since his unprecedented return to Sacramento in 2011.
It's important to convey a more detailed message on what will be different on the day of go-live, how users can be prepared, and reassurance of post-production support.
