In the Message+ app on my Droid Turbo2, I click on the three bars next to Conversations and select Settings->Account->Manage Devices where I can Disconnect any Connected Devices.
So the Message+ app Manage Devices does NOT show other connected devices like your Windows 10 PC, e.g. as it does for me below? What if you log into Message+ on your desktop and look at connected devices there? I am using integrated messaging and all connected devices are using the same phone number. Where is it you're getting the '5 devices limit'?
Also, what about logging into MyVerizon.com and select Plans->My Plan & Services->Send A Message->(three bars)->Settings to Manage Devices, e.g.
Thank you for attempting that and sorry you were not successful in removing those other devices. Are you attempting to remove those other devices using the app on the phone that is the primary device? If not, that is where you will need to initiate that from. If that is where you are attempting this from and you only see your device, where do you see that you have multiple devices connected?
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in the phone app yesterday I only saw the phone itself; today it lists five windows pcs and deleting one allowed successful installation into new pc. So all set.