DLP policy tooltips not appearing in Outlook 365

Hi,

I have configured a DLP policy in compliance.microsoft.com to provide a tooltip with override if certain keywords are found in the email. The policy works as intended in Outlook for Web, but does not appear in Outlook 365 Desktop. My rule looks like this:

Content contains...<a custom information type list>

Sender domain is...

Recipient address matches patterns... (Recipient domain is...not allowed)

Restrict access or encrypt the content in Microsoft 365 locations - checked

Block users from receiving email or accessing - selected

Block everyone - selected

Use notifications to inform your users - On

Notify the user who sent, shared, or last modified the content - selected

Customize the email text - selected

Customize the policy tip text - checked

Allow overrides from M365 services - checked

Require a business justification to override - checked

Send an alert to admins when a rule match occurs - On

I've followed the instructions here: Send email notifications and show policy tips for DLP policies - Microsoft 365 Compliance | Microsoft Docs

and I've followed troubleshooting instructions here: Troubleshooting Data Loss Prevention (DLP) policy tips - Office 365 | Microsoft Docs

I am testing with Windows 11. I'm hoping one of you with more experience setting up DLP tool tips successfully can help me out.

Thanks! - Richard