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OWA signatures are not updating in Office 365


OWA signatures are not updating in Office 365 even though deployment is successful and there are no errors in the Status Monitor in Email Signature Manager.


Microsoft enabled the roaming signatures feature on all Office 365 tenants in April 2023. This update disables existing documented functionality to set OWA signatures in code using Exchange Web Services (EWS) or using their Set-MailboxMessageConfiguration cmdlet, as described in the following Microsoft article:

Email Signature Manager leverages this functionality to update OWA signatures. As a result, this feature cannot function unless roaming signatures are disabled by Microsoft for your organisation.


Microsoft strongly recommends against disabling roaming signatures, and Symprex does not recommend this method due to difficulties with Microsoft when requesting that this feature is disabled. This process must be completed by Microsoft support, and Symprex support is unable to assist with this due to the nature of the request.

We recommend migration to our cloud solution, Signature 365, which integrates directly with Microsoft 365 and Azure AD. We also apply signatures directly to composed emails using the Outlook Add-in, which does not utilize roaming signatures on the tenant.

The Symprex technical support team will work with your company to ensure that existing Templates, Campaigns and Disclaimers are migrated across to the Signature 365 platform.

If you wish to disable roaming signatures for your organization, you can use the following template when contacting Microsoft support:

Please note: Version 9.5.1 or later of Email Signature Manager is required for OWA signatures to be set.

Ticket content


Exchange PowerShell command Set-MailboxMessageConfiguration is failing to set HTML signature.


Your documentation for Set-MailboxMessageConfiguration includes this note for the SignatureHtml parameter:


Please can you disable Outlook roaming signatures in our organization.

To confirm this has been disabled by Microsoft, check the following

1. Logon to OWA

2. Open Settings, select Email and select Compose and reply.

3. If your Compose and reply settings include the option to add signatures clicking + New signature then the roaming signatures feature has been enabled on your Office 365 tenant:

Applies to

Email Signature Manager, all versions

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