I had the same issue with wifi on the push, yet not connecting to the laptop on the same router with its ethernet/wifi connection. Luckily i had a usb to ethernet dongle which worked when plugged into the Push 3 USB A port. The instruction videos doesn't show the full procedure involved with entering and confirming the network password. Foolishly this is skipped.
I've authorized the Push yet it still shows Live 11 Intro on the Push software screen, when i have the Live 11 suite authorized on my laptop.
Once again the instruction video cheats by showing Live 11 Suite already on the push as it guides you through the Authorization process. This means the video guide is not an accurate reflection of this process.
Also I really wish there was a simpler way to get the software Packs into the push, eg if there was a procedure to remove the SSD to USB M.2 interface and physically move the Packs data from the Pc to the ssd via a Linux installation partition on the same computer with [windows] Live installed., or by something like DiskGenius.
Having to sit and watch each pack updated to the Laptop and then moved the Push is a real drag. This whole thing could be automated so you select the packs you want and this it batched into the laptop, and similarly batched to the Push.
[EDIT] Solved the issues above.
I had upgraded the SSD from 250gb to 2TB, this required me to delete the /data partition and recreate the partition via Gparted on Linux, to use all of the extra space on the drive. The problem with this is it came with premission errors meaning the Push OS couldn't write the config files it needed to that /data partition.
When i Authorise the PUSH I got the following error -
The file "/data/.local/share/Ableton/Installation.cfg" cannot be opened for writing because it is write-protected. At least this clue was there.
It seems the same write protection prevented the wifi password from being saved along with its config files. There were no other clues to this.
The solution was simple enough, I removed the SSD to an M.2 to USB Dongle, then booted into a Linux installation which allowed me to see the drives.
The following result was found when searching for write-protection faults.
" Open the terminal.
Type sudo chmod 777 /data/ and press Enter. This command will give all users full read, write, and execute permissions to the directory /data/.
If prompted, enter your password and press Enter.
"
In my case, the /data partition was found as /media/<user name>/data . The command was modified to sudo 'chmod -R 777 /media/<user name>/data'.
[where -R recursively sets read/write/execute globally for all the files on that drive. ]
Now with the SSD back in the Push, I did another factory reset, [as other config files from the initial boot won't be where they need to be. ]
I then reauthorized the Push, this time there were no errors. When i rebooted the PUSH it showed "Ableton Live 11 Suite". 1.8tb space available
As a bonus, the Wifi now works.
After allowing me to save the password, the selected network is displayed in green. Once again there were no clues to why this failed before.
I guess drive upgrades and write protection faults were never anticipated. A failure to verify a file write-to-drive could have been followed by the Push OS correcting for that fault.
I hope others find this useful.
#upgraded SSD