Macbook Pro 2015 Won't Automatically Connect to Wi-Fi

Do you mean you upgraded to Catalina from an older version of macOS such as Mojave? Or were you already running Catalina and just installed a small update to Catalina? I do know that 10.15.4 point update has caused introduced multiple issues, but I'm not sure on exactly what those issues are.

Try creating a new user account and testing the WiFi from the new user account.

Try booting into Safe Mode.

Run EtreCheck and post the report here using the "Additional Text" icon which looks like a piece of paper.

Except for the AppCleaner app I don't see anything in the report, but hopefully another contributor will inspect it just to be sure. You should uninstall the AppCleaner by following the developer's instructions. Cleaning apps are not needed on Macs and they usually cause more problems than they solve.

If @Grant's suggestion for making sure the "Ask to join new networks" box is checked in your WiFi network settings doesn't help and the other contributors don't have any better ideas, then you should perform a clean install of macOS by first erasing the whole physical drive before reinstalling macOS. Just boot into Recovery Mode or Internet Recovery Mode and perform a clean install of macOS.

https://support.apple.com/en-us/HT208496

Do not migrate or restore from a backup yet. Make sure everything works properly with just a clean macOS. If everything is working you can then try to migrate just the user account and your data making sure to deselect the "Settings" option for the user account (also deselect every option outside of the user account). Do not migrate any apps or other settings. Hopefully this minimal migration won't bring back the problem to the clean install.

It sounds like you are saying it won't automatically join Known networks. That brings to mind

system preferences > network > Wi-Fi :

The box at the red arrow should be checked, except in VERY special circumstances.

The current version of Parallels as shon on their splash page is version 15. I am not certain, but you may be running version 10:

Kernel Extensions:

/Applications/Parallels Desktop.app

prl_hypervisor.kext (Parallels, Inc., 10.0.1 27695 - SDK 10.7)

prl_netbridge.kext (Parallels, Inc., 10.0.1 27695 - SDK 10.7)

prl_usb_connect.kext (Parallels, Inc., 10.0.1 27695 - SDK 10.7)

prl_vnic.kext (Parallels, Inc., 10.0.1 27695 - SDK 10.7)

You are running a third-party VNC program. MacOS has built in VNC, both Server and client, and this could be a source of convicts:

https://til.hashrocket.com/posts/69cbe9b2c3-how-to-use-the-hidden-vnc-client-in-mac-osx

Your Hosts file has been extensively modified. The extent of the modifications is very unusual:

System Software:

macOS Catalina 10.15.4 (19E287)

Time since boot: About 6 hours

Configuration Files:

/etc/hosts - Count: 107

Hand shaker agent, which appears to be an App for Wi-Fi connecting to your Android phone, could be a problem area if it modifies standard Wi-Fi protocols to make that connection. You should try removing it for a while to debug.

You have also added a VPN, which could be complicating connection. If you do not absolutely need that to connect to a corporate computer, you should consider setting that aside for a while to debug. Be sure if you use it, it is completely up-to-date.

Only 40GB remains on your boot drive. That is not enough for good long-term stability. You will need to do something to fix that bottleneck soon. For perspective, MacOS uses 9GB just to start itself up.

Here is a "glossy" article on the Hosts file. page 3 of 3 tells you how to set it back manually to what "shipped in the box"

https://www.imore.com/how-edit-your-macs-hosts-file-and-why-you-would-want#how-to-edit-the-hosts-file

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My new MacBook Pro will not find WiFi networks after it starts.

I have to use my iPhone hotspot to connect to internet and then I will see the other Wifi Networks...

Then I can connect to the Wifi network and all is well...Weird.