Mailbox is not accessible : "Incorrect username or password.". In the meantime, mails will not be fetched in the mail fetching schedule.

Mailbox is not accessible : "Incorrect username or password.". In the meantime, mails will not be fetched in the mail fetching schedule.

Recently within the last week we started getting this error in Service Desk Plus:
Mailbox is not accessible : "Incorrect username or password.". In the meantime, mails will not be fetched in the mail fetching schedule.

We are on version 14.6 Build 14600

We are using EWS with OAuth and this has been working fine for over year until a few days ago. Our Azure App Registration Client is showing that it has notsecret has not expired but I went ahead and created a new client secret anyway but I still get the error message shown above.

On Microsoft Entra sign-in logs I see this error:


Failure reason Device object was not found in the tenant '{tenantName}' directory.

Additional Details
Invalid grant due to the following reasons: - Requested SAML 2.0 assertion has invalid Subject Confirmation Method - Application On-Behalf-Of flow is not supported on V2 - Primary refresh token is not signed with session key - Invalid external refresh token - The access grant was obtained for a different tenant

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