After upgrade to MacOS Mojave, I cannot login or connect to App Store.

I really hope you guys get issues sorted soon, I've had minimal issues and as I've said I've resolved all I can, the others remaining in my case are App issues, which I've been in communication with the developers for, and really, it's only one pice of software, and the issue is minor, and doesn't affect daily use of the system.

I do feel for those on this thread, and others I've read that are having issues. I've beta tested for Apple the last few os releases, and know what kind of issues that can come up. Since I didn't really have any issues with Mojave, that weren't easily fixed, I had my hopes more people would be able to experience a problem free upgrade this time around. At least, more so than the last couple versions.

So I got tired of waiting around for a response from Apple. Luckily, my wife owns two MacBook Airs, one for home and one for work. I waited to update the work machine because it was having some other issues. So today in short I restored my wife's home MacBook Air that was having the issue from Time Capsule backups of her work one that has no issues with the App Store. All I had to do is make some minor tweaks with some software installs and uninstallation, but all is good now. So if you have another Mac and want to try this, it should work!

I wanted to double check my system for the "Previous Content' folder a poster posted several posts above, just to make sure I didn't have any left over stuff, even though my App store is working. The issue is, they didn't leave the path to where the folder was, and Google didn't bring back any results of a folder with that name regarding macOS.

Where was your Previous folder located with the other version of the App Store? It's not in my Applications folder, or root of the hard drive, or any other typical place I've searched.I initiated the command to create the locate database, so I'll use that in a bit, but if you could give any feedback on where you found the mentioned folder, would be appreciated.

Thanks.

Thanks, I guess my upgrade got cleaned up correctly. I didn't have this folder. I also only have one copy of the Mac App Store. Everything's been a cool breeze here, ever since I cleaned up the App Store, and reset it to defaults by removing the files I mentioned in an earlier post.

One other note, while I use the App Store for some of my items, I really prefer to buy directly from the developer when possible, usually makes things easier to manage, and they are free to include features apple's App Store policies prohibit.

I'm also having this problem. It started when I downloaded the beta of Mojave and persists through the release. If you open Console, you should be able to start to diagnose what is causing the error, although I haven't been able to fix it yet. I have reported it to Apple and hopefully a future update will resolve it.

Here's the code that I've found in Console for my issue. As you can see, there appears to be two different instances of the files that would authenticate my sign in. Unfortunately, they're owned by Root and can't be deleted, changed or renamed. Ironically, the sign in credentials seem to be accepted because if I use the wrong credentials it rejects them. Even with the right sign in, I always see Sign In in the lower left and in the menu, and I'm unable to purchase items or to upgrade existing applications.

Sep 25 07:26:13 Rons-MacbookPro-3 App Store[2783]: DEPRECATED USE in libdispatch client: dispatch source activated with no event handler set; set a breakpoint on _dispatch_bug_deprecated to debug

Sep 25 07:26:21 Rons-MacbookPro-3 App Store[2783]: objc[2783]: Class ITNSImage is implemented in both /System/Library/Frameworks/iTunesLibrary.framework/Versions/A/iTunesLibrary (0x7fff86114568) and /System/Library/CoreServices/SetupAssistantPlugins/iTunes.icdplugin/Contents/Ma cOS/iTunes (0x11f5567c8). One of the two will be used. Which one is undefined.

system.log. You can leave Console open as you try and log in and watch it update the log with any error it encounters. Note the time before you log on so you can easily isolate the entries. Alternatively, you can search on App to find the related entries.

I seem to have the same issue. Here the two lines from system.log. Maybe somebody can make sense out of it...

Sep 30 19:09:37 iMac App Store[794]: DEPRECATED USE in libdispatch client: dispatch source activated with no event handler set; set a breakpoint on _dispatch_bug_deprecated to debug

Sep 30 19:10:01 iMac App Store[794]: objc[794]: Class ITNSImage is implemented in both /System/Library/Frameworks/iTunesLibrary.framework/Versions/A/iTunesLibrary (0x7fff8f217568) and /System/Library/CoreServices/SetupAssistantPlugins/iTunes.icdplugin/Contents/Ma cOS/iTunes (0x10f22e7c8). One of the two will be used. Which one is undefined.

Just wanted to post an update, that I did an application cache clean today with a PRAM reset. While I wasn't having any issues. It does feel like it has smoothed things out.

I noticed that clearing cashes deleted my exiting installed updates list for the App Store, but it still functions as normal.

I have this problem too, not only with the App Store but also with Apple Books (book store). Same issue, cannot log out and cannot open the book store ( internet connection required). I do not have problems with the iTunes Store. More of you who reconize this also?

I should have asked this earlier, but those of you having these issues with Mojave and the App Store, etc are you having any issues with iOS 12, on your same connection? Just curious if there is any sore of connection.

OK, that's good. I wasn't having issues on either of my iOS devices. As you know I fixed my glitches on Mojave. Was more thinking since iOS, TVOS, and macOS share some of the same internals, that it could be a bug there. Since not, sounds like it's related to the Macs more specifically.

When Mojave works, it feels like a very nice ride. Hope Apple speaks up soon.

One of the hard things I find about helping on forums is you usually don't know the people directly, and can't handle the setups for myself. So I only have what the people say to go on. In this case though it sounds like Apple knows about this issue now, and it doesn't seem to be a specific group of people affected with any specific setup circumstances.

This isn't a question directly in line with the topic of this thread, but, is there a way to contact Mods here?

I was reading that they are the only ones that can change a username, and I would like this one changed to one of my nicknames I use on a more consistent basis. I created this years ago, and I don't even remember why I picked this name.

I was able to get the App Store to work by booting my Mac into Safe Mode (hold down the shift key until you see the Apple logo). Right now the App Store only works for me in Safe Mode so there's a conflict someplace. After I boot back into normal mode my MacBook once again cannot connect to it.

Neither using my Admin account or signing in, in Safe Mode, worked for me. It looks like I'll have to wait for Apple to fix this problem. I'm convinced that in my case, there are remnants of the old App Store on my drive that for whatever reason were not cleaned up during the installation process.

So I created an additional ADMIN acct and App store works great in that account, when I go back to main acct back to same issues everyone is having here. There must be a way to see differences in accts to see what need to be modified.