Delayed or missing notifications from work profile apps is a common complaint, particularly for messaging and email applications like Teams, Outlook, and Slack.
The most frequent cause is Android's battery optimisation. Adaptive Battery and Doze mode aggressively limit background activity for apps that are not being actively used, and work profile apps are not exempt from this by default. When a work app is hibernated by the system, it cannot process push notifications until the next maintenance window, which may be minutes or longer.
On the device:
Via EMM policy:
Other considerations: