A number of customers have reported Outlook crashing on launch, Microsoft has confirmed the issue under Incident ID IT251711.
Users experiencing the Outlook iOS mobile app crashing when installed through Volume Purchase Program (VPP) User Impact: Users experiencing the Outlook iOS mobile app crashing when installed through VPP. Current status: We’re investigating a potential issue and checking for impact to your organization. We’ll provide an update within 30 minutes. Scope of impact: Any users who installed Outlook iOS through Microsoft Intune VVP may be experiencing the impact.
We are also working to identify the scale and underlying application issue.
Application version: 4.2115.0