Hello KristopherJN ,
I apologize for any confusion I may have caused. I was trying to identify if the extra eero was added to the network or not. If the eero is showing as online and wireless, then I would have you check the details of that eero to see if it might be a display bug on the home screen of the app. We would be able to also run some speed tests on a device wired or connected via WiFi to that access point to help us determine if it was just a display bug.
If it showed as wireless there, then we would need to start down the chain to find out where the disconnect is coming from. Is it the extra port on the Gateway eero? Is it the ethernet cord going from the Gateway eero to the switch? Is it the switch itself? Is it a port on the switch? Etc.
However, if the eero was not even coming online or being able to be added to your network, example: the eero might have a wired backhaul going out to a detached garage and is not in wireless range of the Gateway eero, then we would be trouble shooting in a similar manner to check all the connections but I would know that we need to move the eero closer to the Gateway and get it added to the network first to make all subsequent testing easier.
If you would like, you can give our phone support a call. I'll provide a link below that will help you find the best number to reach out to us at. We can also troubleshoot over email if you would like. I will direct message you with instructions on how to get an email to me.
https://support.eero.com/hc/en-us/articles/207376426-How-do-I-contact-eero-support-