Why do I no longer receive push notifications after turning on Ultra Power Saving Mode

I recently turned on Ultra Power Saving mode (for my Samsung Galaxy S9) as I forgot my charger at home on a work trip. After turning UPS mode off, I realized I wasn't receiving any push notifications for any apps. This is especially painful because I need to get Microsoft Outlook notifications every time I get an email. And before you ask, yes I restarted my device and made sure push notifications were turned on :) . What settings/configurations do i need to change in order change this back? Thanks

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