Fix Server Does Not Support Current Authentication Protocol

While trying to access any of the Microsoft Office apps, you may encounter this server does not support authentication protocol error. The full error reads: The server you are trying to access is using an authentication protocol not supported by this version of office.

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This error can occur with the OneNote app or on OneDrive for Business during the synchronization process. Several users have reported similar issues in the Microsoft community forum as well:

How do I fix the server authentification protocol error?

1. Add Office 365 account

Start an Office application apart from the one you are experiencing the problem with
So, if you are getting the error with OneDrive client, open MS Word
Click on File and select Account
Under the User Information section, click on Switch Account
Next, click on Add Account
Enter the details for your Office 365 account that is associated with OneDrive for Business
Sign out for any accounts other than the Office 365 account that uses OneDrive for Business
Close MS Word
Click the small arrow icon in the Taskbar
Right-click on OneDrive for Business and select Exit
Relaunch OneDrive for Business from the Start menu
Right-click the OneDrive for Business cloud icon in the taskbar
Select Sync now
Check if the server not supported error is resolved

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So, if you are getting the error with OneDrive client, open MS Word

2. Remove and re-add the accounts

Start an Office application apart from OneDrive or OneNote app
For example, start MS Word
Click on File and select Account
Under Connected Services, click on Remove all the services that is not related to Office 365 account
Exit the MS Word application
You also need to exit the OneDrive for Business if it is open
Click the small arrow icon in the Taskbar
Right-click on OneDrive for Business cloud icon and select Exit
Open OneDrive for Business app
Right-click the OneDrive for Business cloud icon on the taskbar
Click on Sync Now and check for any improvements.

Try following the above steps in case the first method didn’t resolve the issue.

For example, start MS Word
You also need to exit the OneDrive for Business if it is open

To make the OneDrive library sync successfully, you may have to remove all accounts that are signed in except the Office 365 account.

3. Update Microsoft Office

Start an Office application like MS Word
Click on File and select Account
Under Office Updates, click on Update Options
Select Update Now
Windows will download and install any pending updates for the Office
After the installation is over, launch OneDrive or OneNote and check for any improvements

According to Microsoft, this error occurs due to a software glitch. By removing and re-adding the account, you can resolve it quickly. If not, install the latest version of Office to fix it.

Windows will download and install any pending updates for the Office

Do you know any other methods to solve the issue that we may have missed out on? Let us know in the comment section below.

How do I fix the server authentification protocol error?#

1. Add Office 365 account#

2. Remove and re-add the accounts#

3. Update Microsoft Office#

How do I fix the server authentification protocol error?

1. Add Office 365 account

2. Remove and re-add the accounts

3. Update Microsoft Office