@MC515
Hello,
If you have 2 RE220, you need to set up one of RE220 first, after the configuration of the first one, you can unplug it, then set up the second RE220.
You can create a different network name for them when you set up them. If you want to keep the same network name, it is ok.
It is better for you to use the web interface to set up the range extender.
Here are the instructions to configure the RE220, you can follow them to set them up one by one. Please connect to the RE220 first before configuring it.
a. Setup video: https://www.tp-link.com/en/support/download/re220/
b. Configuration guidance: https://www.tp-link.com/en/support/faq/1400/
Note:
a. Please use the home wifi password of the main router to configure it.
b. In step 4, we suggest you customize the network name of the extender, do not copy the main router.
If you need any further help, please tell me the light status on the range extender and what error information you have got.
Good day!