Windows 10: error 0x80190194 with Mail & Calendar App on Windows 10 Adding a Yahoo Email

hi, been having this issue randomly over the past... maybe 2 years or so. unsure how the all other instances started except for a few, one of them happened from just updating windows, another was updating the mail app, one happened because i changed an email account's password, and yes, it's NOT always the yahoo account.
here's what's going on...
trying to add my yahoo email since i JUST reformatted/re-installed windows 10 on my PC a couple hours ago and just got done installing and updating everything. went to add my email's to the app as i usually do, for yahoo i have the "account key" thing which works fine(yes even turned that off and tried). this time after hitting the "maybe later" button for permissions by accident instead of the "accept" button , it's since then didn't add nothing, and nothing happened, got an email on my yahoo that it signed in. went to try and add it again since the yahoo account doesn't show at all and instead i get the error. it's like the yahoo mail is signed in, but nothing shows related to the account and so i'm unable to remove it. i have uninstalled the app many times and quite a few different ways, did the app reset which doesn't actually reset anything it seems, especially needed for this other than reloads emails from my other email accounts that i'm able to delete and re-add just fine. i have yet to come across ANY fix for this except reformatting and reinstalling windows, which... for a simple app... no. already did that twice in the past. i don't know what i can delete to fully reset this app so i can re-add my emails since i was testing with one of my other emails and EVERYTHING to do with it stays with all these uninstalls and resets...
ways I've "uninstalled" the app... normally, CCleaner, IObit's uninstaller WITH removing residual files, 3 or so different ways of uninstalling it through CMD/PowerShelll, even adding things that's suppose to fix it through CMD and a few other ways... I've even gone into safemode and done a few of the things with no differences. it seems to be leaving stuff behind that makes this unable to be fixed or something, found MANY post's and forums about this with many of them locked, yet, unresolved related to this app...
I've even gone into my yahoo account and signed out of everything to give that a try and not difference.

other notes. the account i'm trying to sign in with is also my account i use for windows login and is digitally signed with the same account. so unsure if that's a related some how to this issue.

if there is a fix for this else where, sorry, i haven't found it as I've only found post's about it since windows 10 was out, and recent that were all locked and seems like all of them were never resolved and re-installing windows should NOT be the answer to this... means something needs to be fixed with windows or the app or something. sadly, i'm not the only one who's had issues with this in the past, i just get it a lot because i reformat every so often.
i will have a screen shot of the error window that shows up EVERY time i try to add my yahoo account, BUT with every attempt, my email also get's a email saying it signed in...

:)

 

error 0x8007042b when adding a Yahoo Mail account to MS Mail App

I went this route and added passwords for yahoo mail. I might try this method above to get gmail to buck up! *Tongue

@Bastet, this is probably what you were referring to the whole time.


YAHOO MAIL FIX
2FA needs to be enabled which it already was and just follow these steps below.

1. In yahoo mails account security, click on manage app passwords.




2. After selecting other app and entering the new app name in the text box




3. Now, in Windows 10 mail app, add this type of account.




4. In Windows 10 mail app, enter your details and the password generated by step 2.




Fully functional mail app again.



GMAIL FIX

Now similar steps to setting up Gmail. Here I'll only go through the Gmail steps as Windows Mail App setup is the exact same.

Follow this jpeg below, all steps are merged as there's a 5 attachment limit.





- - - Updated - - -

I've edited it to show the solution for Gmail also.

 

error 0x8007042b when adding a Yahoo Mail account to MS Mail App

Yes, once 2-factor authentication is enabled you should then create the app specific password & enter it instead of the account password.

 

0x8007042b error when adding yahoo or gmail accounts to Windows 10 Mail and Calendar app

There's a similar thread from 2015 How to solve error 0x8007042b while connecting a Google account on Windows 10? here but none of the answers worked. The manual method of adding accounts doesn't work with Calendar, which for some strange reason is bundled with the Mail app!

My current build is:

This is what I've tried so far:

1. That thread at the top of this post.
   
2. Created a system restore point.
   
3. Opened Microsoft Store → Settings → unchecked Update apps automatically so it won't automatically add the app upon the next restart. Done this prior to doing anything as Windows installs the Mail and Calendar app the first chance it gets.
   
4. Removed any existing accounts that were added manually to the Mail or Calendar apps.
   
5. Allowed windows full access to my location.
   
6. Signed into my Microsoft account → cleaned out all items from the screenshot below at this address https://account.microsoft.com/privacy/activity-history.
   
   
   
7. In PowerShell as admin.
   
   • WSReset.exe
     
   • Get-AppxProvisionedPackage -Online | Out-GridView -PassThru | Remove-AppxProvisionedPackage -Online
     and highlighted the microsoft.windowscommunicationsapps item and clicked OK to delete it.
     
   • wmic useraccount get name,sid which returned a formatted number beside my username: x-x-x-xx-xxxxxxxxxx-xxxxxxxxx-xxxxxxxxxx-xxxx.
     
8. In Registery Editor as admin.
   
   • Navigated to the key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\AppxAllUserStore\x-x-x-xx-xxxxxxxxxx-xxxxxxxxx-xxxxxxxxxx-xxxx and deleted that associated number found above.
     
9. With RegScanner in admin
   
   • Searched for entries associated with Mail and Calendar which have the PackageFamilyName name: microsoft.windowscommunicationsapps_8wekyb3d8bbwe and deleted any of them.
     
   • This left me with these which could not be removed. Their paths vary for:
     
     • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\StateRepository\Cache and this entry HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\BackgroundModel\EmptyHostDisallowList microsoft.windowscommunicationsapps_8wekyb3d8bbwe REG_DWORD 0x00000001 (1) 19/03/2019 04:53:42 4.
       
     • See screenshot below of any registry items found with the keyword search used microsoft.windowscommunicationsapps.
       
       
       
10. Restarting the PC, then adding the app back in, in the Microsoft store.
    
11. Still getting error 0x8007042b when I try to add either Yahoo or Google accounts to either Mail or Calendar.
    
12. This leads me to believe that the cache registry folder in step. #9 above is the culprit which cannot be deleted, even when I tried using Registry DeleteEx.
    
    • FYI, I have even user ids inside the folders here Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\StateRepository\Cache\User which no longer exist.