It could be they are each using a different name/password. This would make using one not work for the other. It could also be one is set up to run at 2.4 or 5 GHz while the other only runs on one (or one for each, etc.). Which would limit what devices can access it. Lastly, there could be a problem with the modem/router itself on the second one. I would check with your companies tech department to make sure you have the right info (log in name and pw) and also that the others listed here (or even something else) isn't restricting access.