MacOS Ventura is completely broken and impossible to use on my MacBook Pro 16 2019

When you reinstalled macOS, did you perform a clean install by first erasing the drive? Did you thoroughly test the clean install before installing any third party apps or restoring from a backup? If not, then you likely brought the problem back.

You can try booting into Safe Mode to see whether you connect to the Internet. If Safe Mode works, then you most likely have some third party software installed which is interfering with the normal operation of macOS. Typical culprits are anti-virus apps, cleaning/optimizer apps, and third party security software. None of these types of apps are needed on a Mac and usually cause more problems than they solve, plus they impact system performance. If you have these types of apps installed, then uninstall them by following the developer's instructions. If you don't have these apps installed or have already uninstalled them, then try running EtreCheck and posting the report here using the "Additional Text" icon which looks like a piece of paper so we can examine the report for clues to assist you.

Are you using WiFi or a wired Ethernet connection?

You do need to distinguish between being able to connect to the WiFi, getting a valid IP address for the home network, and actually accessing network locations outside of your local home network....each of these things are different and we need to determine which one of these items the process fails at. Are you able to successfully connect to the WiFi? The WiFi icon on the menubar should show dark black bars and should show the WiFi information.

Installed Ventura 13.1 last night and it broke my macbook with "login item notifications". And guess what? You can now use your iphone camera as a webcam but it will longer let you view or stream any other way. Tech support was tryng to tell me the "login item notifications" are features!!!, not a bug. Having an inconsequential login failure of some kind was a not an issue for me, macos nagging me about it incessently is a big one! That's a bug not a feature, and I'll be wiping my macbook to get rid of Ventura and stick with Monterey, like something I haven't had to do with a windows machine in 20 years. It will be the second my macbook air has needed a wipe in 18 months. Apple is the new Microsoft!

See K_Faith on Any solutions for Slow, dropping or no WI… - Apple Community also

and 9to5's https://9to5mac.com/2022/07/26/uninstall-macos-ventura-beta/ Uninstall macOS Ventura beta: Revert to macOS Monterey

BUT REMEMBER they are not Apple however much they are intertwined with the company

Him I'm sorry you are in Ventura ****. And being ignored. I am STILL coping and in process of backing up for the first time my "new" computer MBP 2019 just u sed in Dec, and will reset to manufacture standards. The hope is that I can upload a new OS and I expect to be helped by the people at Apple. I advise you to make sure you get your case escalated, and that you say how much time you have spent on the communities pages etc etc., and also that you have heard of a case Case ID: 101927483307 in which the problem was recognised and in the process of being followed up. It still means hours on the phone with the tech people who require you perform different tests before your case is escalated, when the higher tech people instruct you to perform those and additional tests..... and I hope one of them catch what you have. But I am being instructed to do what I'd feard 2 weeks ago....delete entire hard drive and find a way to install a new, older one, maybe Monterey. They were not sure I 'd be successful and so the story is unfinished. But get some help; it's their software that is faulty and it is more than frustrating to lose so much valuable time. We shall stay tuned.... Good luck

My reply to you posted below. here is copy

Him I'm sorry you are in Ventura ****. And being ignored. I am STILL coping and in process of backing up for the first time my "new" computer MBP 2019 just u sed in Dec, and will reset to manufacture standards. The hope is that I can upload a new OS and I expect to be helped by the people at Apple. I advise you to make sure you get your case escalated, and that you say how much time you have spent on the communities pages etc etc., and also that you have heard of a case Case ID: 101927483307 in which the problem was recognised and in the process of being followed up. It still means hours on the phone with the tech people who require you perform different tests before your case is escalated, when the higher tech people instruct you to perform those and additional tests..... and I hope one of them catch what you have. But I am being instructed to do what I'd feard 2 weeks ago....delete entire hard drive and find a way to install a new, older one, maybe Monterey. They were not sure I 'd be successful and so the story is unfinished. But get some help; it's their software that is faulty and it is more than frustrating to lose so much valuable time. We shall stay tuned.... Good luck

I can't relate to Catalina problems but shame on them yes. You definitely need Apple Support if you do not find anything useful in these pages. Your error page will help the techies on Apple Support so at least you have that. Have you tried any of the suggestions on these two ongoing discussions on the forum, this and another page (I've posted on two). Have you done all checks with ISP? Run disk utility? Search with other key words AND Ventura and good luck.

Also see K_Faith on https://discussions.apple.com/thread/254584069

A month later ... what did you do? I was obliged to upgrade to Ventura to connect to a new printer and not only does the printer not work Epson ET 3850 but neither does internet connectivity, Trying everything. Thanks for any tips if you are out there and engaged,,,,

I am still in the same situation, no wifi connectivity at all. I can only connect to the internet via ethernet cable.

My computer is out of warranty and I called Apple support but they weren't helpful at all. It was very difficult to make them understand that my problem only started when upgrading to Ventura and all our other Apple devices have no problem whatsoever to connect via wifi.

I am a bit lost as to what to do next. I might try Apple support again but I'm not very hopeful about that.

Any help from anybody will be highly appreciated.

Same kind of problems here. Have been running my Macbook Pro for years fine and now was forced to update to Ventura since Catalina wasn't supported anymore by Apple (shame on them). Now I need to reload web pages very often so I can get them loaded and many web applications fail, because the requests on the background fail.

This is my most used "website" currently:

Hello, did you get this problem sorted? I have the same problem since I upgraded to Ventura 13 and the only way I cannot connect to any wireless network. I can only use the wired ethernet connection.

SAME. After re-instqlling Ventura I think I have to find out how to wipe and install Monterey....which will not work for peripherals. Makes machine useless.