Facebook is removing the messaging service from the web app and is forcing its users to move to Messenger app. The reason behind this is that Facebook wants to provide the best messaging experience to its user via the messenger app.
Facebook has recently announced that they are going to eliminate the messaging option from their web app. Facebook wants its users to use Facebook Messenger instead of their web app, which is soon going to close.
According to facebook, they want users to provide the best messaging experience with Messenger app.
Some are experiencing this error via Web app "Your Conservations are Moving to Messenger” and is eventually redirecting users to Google Play store to download Messenger app.
Facebook Messenger app also allows users to chat freely, and use stickers. You can make the voice call as well as video calls too with the help of Facebook’s messenger app. So moving to a messenger app would be a right choice.
I would strongly suggest you download the Facebook messenger application because Facebook is forcing users to Download it. It's better to be on the safer side.
Download the Facebook messenger application