Many users have ever encountered the Microsoft something went wrong 1200 error.
Here is a true example:
Hi
like advise how we can fix the problem on our Outlook accounts.
Error Something error 1200 or something went wrong.
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How to Fix Microsoft Something Went Wrong 1200
Fix 1.
In this case, it’s crucial that you clear browsing data to deal with this issue.
Here are the steps to reset the cookies and cache data of your internet tool.

We take Google Chrome for example.
In Google Chrome, click thethree-dot iconlocated in the upper right corner and selectSettings.
In the pop-up window, clickClear browsing data.

Then check all the options under theBasictab and click theClear databutton.
Fix 2.
Here are the major steps.
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PressWindows + Rkey combinations to initiate the run command line window.
In the text box, jot down%localappdata%and pressEnter.
In File Explorer, find and double-click theMicrosoftfolder, then right-click theCredentialsfolder to selectDelete.

Or it’s possible for you to remove the credentials from the Control Panel.
Step 1.Open Control Paneland then clickCredential Manager.
If so, you gotta expand the credentials and click theRemovebutton to delete them.
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Read this tutorial to learn more and how to download the ISO files.
Fix 3.

Perform a Clean Boot
Third-party applications sometimes prevent your program from working or logging in.
After finding the third-party program, you could disable it or uninstall it.
Fix 4.
Wrong operations to the registry could make your setup unbootable.
PressWindows + Rkeyboard shortcuts.
ClickYesin the UAC window.
Navigate to the following location:
Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity
Step 4.
In the left panel, right-click theIdentitykey and click theDeleteoption from the context menu.
Further Reading
Data loss happens everywhere.