error validating security code

[KatCox]

Suddenly having difficulty accessing message+ on desktop.  Having to re-setup, and the app will not recognize the security code texted to me?  Any ideas on the underlying problem and how to fix it?

[mrychlew]

I'm having the same issue!!  I've uninstalled and reinstalled numerous times, and tried about 15 codes. Same thing....error validating security code....

[dmPotter1212]

Same issue here, where I already have installed it works great. Unable to add new client machines.

[VerizonThePrize]

I have same problem. Started happening after all my devices were booted offline and needed to re-authenticate a couple days ago. Now I can't no matter what machine name I use. I also tried reinstalling multiple times, and even a new install on a fresh copy of Windows, nothing.

[VerizonThePrize · Accepted solution]

Finally figured it out with Verizon support.Go here: My Verizon Online Sign In - Verizon Wireless (My Verizon)

My Verizon > My Plan and Services > Send a Message

Then do the following:

• Open up the settings in the little right tab menu (3 lines)
• Go to manage devices
• Remove the device you are having an issue with (and any unused devices)
• You should now be able to re-authenticate

When it happened to me, it seemed like you could have a maximum of 2 previously saved registrations with a device. My device was already in there twice, and I was trying for a third. Wiping it allowed me to authenticate immediately and I'm all back up and running.

[mslabaugh]

This worked perfectly, thank you!