![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(160, 43%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESL%3C/text%3E%3C/svg%3E)
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
5,322 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 10%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
Hi @Shaun Lennan
Welcome to our forum!
Based on the error code, it appears to be the issue caused by authentication. Try the following possible solutions:
Check if the account is working on other devices or webmail. If it's not working on any device, then it might be an issue with the account itself.
Cut the OneAuth and IdentityCache folders out of the Microsoft folder and paste them onto your desktop. Relaunch Outlook and sign in. (C:\Users<yourusername>\AppData\Local\Microsoft).
If the issue persists, close Outlook, copy the OneAuth and IdentityCache folders back into the Microsoft folder, when it asks if you want to overwrite, say NO. Relaunch Outlook and sign in again to have a check.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.