Choose Account Settings > Account Settings. On the Email tab, choose your account (profile), and then choose Repair. Note: The Repair option isn’t available if you’re using Outlook 2016 to connect to an Exchange account. Follow the prompts in the wizard, and when you’re done, restart Outlook.

Regards,
Peter

How do I reconnect email to a server in Outlook?
Step 1: Open Outlook.

Step 2: Click on the “File”>” Info”> Account and Social Network Settings”>” Account settings”.

Step 3: Select your account and click on the “Change> “More Settings”>” Connection” tab.

Step 4: Under Outlook Anywhere, choose the “Connect to Microsoft Exchange using HTTP” option.

Regards,

Will

Step 1: Open Outlook on your computer.

Step 2: Now, go to “File”>” Info”> Account and Social Network Settings”>” Account settings”.

Step 3: Choose the account from the dialog box, remove the existing account, and re-enter your correct account credentials.

Regards,
Peter