Altering the messenger’s shade will not be potential. Messengers are purposes that enable customers to speak with one another, and so they sometimes have a default shade scheme that can’t be modified.
The colour scheme of a messenger is normally chosen by the builders of the app, and it’s usually designed to match the general branding of the app. For instance, the Messenger app from Fb has a blue shade scheme, which matches the colour of the Fb brand.
