Back story: I decided to get a new router because I could not get my ISP router "EERO Max 7" to allow Plex to connect outside the network(internet).
I purchased Asus BT-BE7200 router. It can be a little clunky user interface, but that seemed to not matter in this issue.
On both of these routers, I did not need to turn off any network settings like 5GHz/6GHz. Bands. As long as they are all working with the same SSID, it should work, but it might be worth trying them separate if you still have issues.
What I think I did was:
-Reset button on the Wi-Fi dongle for 10 seconds until the lights flashed off.
-Using a computer(maybe a phone web browser will work the same), I removed the dongle from my account using the EG4 website, configuration on the top, then Dongles in the Monitoring Center:

-Click the management drop down and then remove.
Next, on your phone:
-Join the wifi for the dongle, "DJ4XXXXXXX"
-Cellular Data turned off
-Going on the app(auto login happened to be turned off).
-Press Dongle Connect button
-Important! Wait for your networks to populate, do not hit refresh. If they don't populate in less than 1 minute, you will have to do this again, or find another way for them to populate. This is the biggest key in my opinion, both times I have had to do this.
-Select your network if it isn't already on top.
-Type in password for the network
-Press HomeWifi Connect. It should then give you the success message.
-Remove your phone from the Dongle Wi-Fi network. Or you can turn your Wi-Fi off on your phone.
-Go to your dongle and see if it is showing all 3 lights illuminated. Mine were all solid.
Next, on your computer or browser:
-Go to Configuration on the top and click it, in the monitoring center,
-Click Dongles on the left,
-On the top, click "+Add Dongle"
-Then type in your Serial number and Pin, and add it to your already made station.
-Click Add, and you should be good to go!
It didn't work trying to do it all through the app for me.
If you ran into the same issues as I did please post if this worked or another way worked.
I also want to note, I kept the same SSID and password as the old router, this and my doorbell camera both failed to automatically connect, that was it.
Good luck, I hope this helps.
I purchased Asus BT-BE7200 router. It can be a little clunky user interface, but that seemed to not matter in this issue.
On both of these routers, I did not need to turn off any network settings like 5GHz/6GHz. Bands. As long as they are all working with the same SSID, it should work, but it might be worth trying them separate if you still have issues.
What I think I did was:
-Reset button on the Wi-Fi dongle for 10 seconds until the lights flashed off.
-Using a computer(maybe a phone web browser will work the same), I removed the dongle from my account using the EG4 website, configuration on the top, then Dongles in the Monitoring Center:

-Click the management drop down and then remove.
Next, on your phone:
-Join the wifi for the dongle, "DJ4XXXXXXX"
-Cellular Data turned off
-Going on the app(auto login happened to be turned off).
-Press Dongle Connect button
-Important! Wait for your networks to populate, do not hit refresh. If they don't populate in less than 1 minute, you will have to do this again, or find another way for them to populate. This is the biggest key in my opinion, both times I have had to do this.
-Select your network if it isn't already on top.
-Type in password for the network
-Press HomeWifi Connect. It should then give you the success message.
-Remove your phone from the Dongle Wi-Fi network. Or you can turn your Wi-Fi off on your phone.
-Go to your dongle and see if it is showing all 3 lights illuminated. Mine were all solid.
Next, on your computer or browser:
-Go to Configuration on the top and click it, in the monitoring center,
-Click Dongles on the left,
-On the top, click "+Add Dongle"
-Then type in your Serial number and Pin, and add it to your already made station.
-Click Add, and you should be good to go!
It didn't work trying to do it all through the app for me.
If you ran into the same issues as I did please post if this worked or another way worked.
I also want to note, I kept the same SSID and password as the old router, this and my doorbell camera both failed to automatically connect, that was it.
Good luck, I hope this helps.