macOS 10.13.6 will not automatically connect to LAN at startup.

macOS 10.13.6 will not automatically connect to LAN at startup

macOS 10.13.6 (updated yesterday from 10.13.4) does not connect to local network at startup. And stopped connecting before OS update.

Connecting to LAN using System Preferences/Network and exiting with ‘Automatically join this network’ enabled (clicked) but is not enabled at subsequent shutdown/logins.

Other Mac (10.13.6) on same network automatically connects as do several iOS devices.

All devices are wirelessly connected. with Airport Extreme. Seems this issue began around the time of addition of 2 HomePods to network.
MARSPATHRetired EE/Computers/ITAsked:
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Try these 2 first:  Turn of the computer and do the SMC reset. Then reset the PRAM.

On systems without batteries or with removable batteries:
Remove Battery (if exists), unplug the power.  Press and hold the Power button for at least 5 seconds.

On system with non-user removable batteries.
Turn off the system.  Plug in the power.  Press and hold the left shift control option keys, then press and hold the power button at least 5 seconds.

Reset the PRAM.
Turn of the power.
Turn on the power.
Press and hold command option p r
Let it chime 3 times.  If you don't hear the chimes (on newer laptops) , wait until you see the apple logo appear 3 times.
Release the keys and let it boot.

If that doesn't work, delete the WiFi adapter.  Reboot.  Then add it back.

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Davis McCarnOwnerCommented:
Lurking in the background of all wireless connections are numerous hidden details including the MAC address (think serial number) of the port being connected to.
The first try at fixing should always be to "forget" that wireless network and then remake it. (Mac, PC, Android, iPhone, all of them).
MARSPATHRetired EE/Computers/ITAuthor Commented:
Thanks for input - need to get time to try your plan
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