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1. Exit Outlook. 
2. Open Control Panel by doing one of the following: 
   1. In Windows 8 and Windows 10, choose Start and Click the Start button and type Control Panel. 
   2. In Windows Vista and Windows 7, choose Start > Control Panel. 
3. Open Mail by doing one of the following: 
   1. In Windows 10, choose User Accounts > Mail. 
   2. In all other versions of Windows, choose Mail. 
   3. NOTE:  The Mail icon appears after Outlook starts for the first time. 
4. Open Mail
   1. Click on User Accounts > Mail. 
5. Choose Show Profiles. 
6. Select a profile. 
7. Click Remove and apply. 
8. Re-add the users by click on the add tap. 

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If that doesn’t work repair outlook 

1. Go to program to Program and featuresFeatures. 
2. Select Microsoft 365 office. 
3. Right-click on it and select change. 
4. Check quick fix.
5. Click on repair. 

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