Akhil_Gopal Did you get an answer on this? I am having the same issue. Microsoft_Teams_team is something you could provide guidance on? Also curios does this special firmware allow the Visual+ to also be used for local sharing to a screen? Also is it possible to remove the sign out button on the VVX series phones once a device is successfully working with the Teams SIP gateway?
EDIT I was able to get this process working with the Trio 8800 it just that the button says "click to dial" as opposed to "sign in" and there is no Teams logo. I was successful utilizing provisioning, activiation and a remote login from the teams admin centre. Microsoft_Teams_team you shold update your documentation to reflect the slight different process on the Trio's! The Visual+ only works for local content, and on the Trio there is no signout button, which is great, Microsoft_Teams_team please remove it from the VVX series phones, or at least make it hard to get to to.