Problem
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.
Reason
Microsoft has enabled their roaming signatures feature on your Office 365 tenant. This update breaks their existing, documented functionality to set OWA signatures in code using Exchange Web Services (EWS) or using their Set-MailboxMessageConfiguration cmdlet. Email Signature Manager sets OWA signatures using EWS. The signatures are updated, but the settings are ignored by OWA.
Solution
Microsoft has described the problem in their documentation for the Set-MailboxMessageConfiguration cmdlet in a note for the -SignatureHtml parameter:
To disable the roaming signatures feature on your Office 365 tenant, you need to open a support ticket with Microsoft Support in your Microsoft 365 Admin center.
When the feature has been disabled, OWA signatures set by Email Signature Manager will work again.
Alternatively, our Signature 365 cloud solution offers a modern Outlook add-in that works in all Outlook clients including OWA, and which is not affected by this issue.
More information
You can determine if the roaming signatures feature has been enabled on your Office 365 tenant as follows:
- Logon to OWA
- Open Settings, select Email and select Compose and reply
- 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