Excel is showing below error.Also, Microsoft Office365 Marketing email keeps on popping up on right side.

Hi，

I suggest you try this method to remove the cached Office account identities from the registry:

1.    Start Registry Editor. 

2.    Locate the following registry subkey: 

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity

1.    Right-click Identity, and then select Delete. 

Serious problems might occur if you modify the registry incorrectly. Before you modify it, please remember to back up the registry for restoration in case problems occur.

Here is an article about how to back up and restore the registry in Windows:  https://support.microsoft.com/en-us/topic/how-to-back-up-and-restore-the-registry-in-windows-855140ad-e318-2a13-2829-d428a2ab0692

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