I'VE GOT THE FIX!!!
I fixed my very similar issue after troubleshooting the issue for 3 days!
I figured it had to do with the device limit and I was able to brainstorm my suspicions with a cox rep tonight and we have successfully connected!
I was in an almost exactly situation as you with devices that would once connect giving me the unexpected error message but working fine on 3 other devices.
PROBLEM: Hotspot is limited to connecting 3 devices PER USER (new hiccup = connected ever vs actively connected), up to 10 users per account, (and possibly 5 actively connected devices but this one seems to not be a problem) --- effectively allowing up to 30 devices to connect to cox if done correctly, using 1 account...over the "life" of the account (or for the 2 years it remembers the devices.
SOLUTION:
Go to your cox.com account
Log in to your Cox account
From the
tab, go to My Profile
Go down to the 3rd section (⇧ User Accounts) & there will be 2 options:
Update Profile and Manage Users
Select Manage Users
From there, you will see Primary User with the previously working credentials
Below that, you will see the Secondary User section where you can Add User
They will ask you to generate a User ID & Password, as well as First Name, Last Name, Nickname, & a Recovery Email. (The same email used for recovery email can be reused for multiple secondary users accounts.)
You also have the option to allow this user to access all billing and payment areas or not.
After you fill in all parts, click Add Secondary User.
Now try to connect to to the hotspot with your aforementioned device using the NEW USER ID & Password when prompted to sign in to your Cox account & VOILA, it SHOULD connect to the hotspot without any pesky error message!
Hope really this works for you too! 🤞🏼