Thanks. I did what you said, but there is no auto join column to check on either Mac. There is a "remember networks this computer has joined" box which is checked. The home network is already on top.
So nothing I did was different.
And I thought this was going to be easy 🤔 What we have here is a setting that has been moved and an 81-year-old brain trying to remember where the 🤬 it used to be. So let's try this again. Once again in Catalina, in the initial
System Preferences > Network window the name of the network appears along with a checkbox to
Automatically join this network. I vaguely remember something similar in older versions of MacOS, but I don't remember exactly where it was/is. Look around and see if you can find that somewhere in the Network window or a similar window.
If you find that option and it is turned on, the next thing I would check is to see if the password is in your keychain. Which would prevent automatic connection.
