Can't Create Wi-Fi Hotspot from Macbook Pro when connected to Wi-Fi (Part 2)

As described in the thread you referenced, the Mac cannot be used to share wi-fi to any other device when it itself is connected to a wi-fi network. Sharing can only be done when the Mac is connected by Ethernet cable internet access. Share the internet connection on Mac with other network users - Apple Support

In your circumstance, one potential workaround would be to subscribe to a satellite internet service, connecting the Mac to that service's router with an Ethernet cable, and then commence to share that connection via wi-fi.

readers have also posted that they would like an Additional Wi-Fi interface for their Mac.

Unfortunately, there was a mass-extinction event when the Mac said no more 32-bit apps after Mojave. There are no wi-fi adapters that work with a Mac.

As the discussion continued, solutions further afield were suggested. Here is one that survived:

Add an Ethernet adapter to your Mac. To your new Ethernet adapter, add a stand-alone ethernet-to-Wi-Fi adapter of any description. if you don't need performance, this one might suffice:

https://www.bhphotovideo.com/c/product/1203432-REG/iogear_gwu637_ethernet_2_wifi_universal_wireless_adapter.html

it does require a power brick or USB cable for Power:

.

Have you considered maybe using a mobile hotspot provided by your cell phone service to connect the Echo and other devices? Your iPhone has hotspot capability.

You're welcome.

I hope that works out for you. 🤞🏽