Sent email cannot be viewed by sender when encrypted.

[adamwaring]

Emails that are sent in outlook are not viewable in the sent items folder of the outlook desktop app but work fine in the outlook web app.

The error that shows is the same as the one for when recipients cannot view the email in the email client but if they click on the link it still does not let them view the email.

Seems to be affecting only certain members of the organisation but there does not seems to be a pattern of software/admin rights/plugins/etc.

Does anyone have any ideas as to what is likely to cause this?

Thanks.

[#2]

I understand you're using Purview Message Encryption (previously OME) with "Encrypt only" and "Do not Forward" templates here. The odd thing is that that feature is very seamless within Microsoft identities and you're saying it's not consistent across your organization either. It would be easier to troubleshoot if so. And also more specific details when it happens, the circumstances.

Could it be that you're using mail flow rules with Purview Message encryption where you force people to use the Purview Message Encryption portal (OME portal) i.e. not letting them use their email clients or possibly using Microsoft 365 Semi-Annual Channel where one will be directed to Outlook on the web to read the message?

[#3]

@ChristianJBergstrom 

They are using the semi-annual channel? Is there a known issue that affects the older versions?

[#4]

It’s mentioned here https://support.microsoft.com/en-us/office/send-view-and-reply-to-encrypted-messages-in-outlook-for-...