Outlook input tool not working

[AnushaKovi]

I used the Outlook input tool to read emails. In the last 4 months, this tool has been working fine in the production gallery. But suddenly from last Friday, I have been getting an authentication error in the production gallery. Still, it works fine when I manually run the workflow in the Alteryx designer.

00:00:00.005 - Alteryx: Running at a Low Priority.

00:00:00.769 - Alteryx: Allocating requested memory would be more than available physical memory. Reverting to 7713.5 MB of memory.

00:00:00.769 - WorkflowId - Alteryx: 81b07684-c014-4566-bc6f-6eb3de0386e0

00:00:00.769 - RunId - Alteryx: e86f8eb1-60c4-426f-94e0-c20e0ccdd7e8

00:00:00.771 - Alteryx: This is AMP Engine; running 4 worker threads; memory limit 7713.5 MB.

00:00:00.777 - Alteryx: The following tool ids are using an e1 compatibility layer with 1 conversion point(s): 93

00:00:00.787 - Alteryx: Running at a Low Priority.

00:00:17.703 - ToolId 83: Plugin initialized.

00:00:18.183 - ToolId 83: Plugin class successfully loaded.

00:00:19.503 - Error - ToolId 83: Failed to authenticate.

00:00:19.602 - ToolId 92: 0 records were True and 0 were False Finished in 00:00:19.630 with 1 error

[apathetichell]

The obvious culptrit would be either a differnet username/password on server vs on Designer. the second most obvious culprit would be a network rule changed.

[AnushaKovi]

I am using same username and password and the network rules are the same. May I know what am I missing?