Plugin not working on Android 5 or 6

[jondspa]

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Provide a general summary of the issue.

Thanks for the great plugin!

Plugin is working great on Android 7, 8, and 9. Not working at all with Android 5 and 6.

Your Environment

• Plugin version: latest
• Platform: Android
• OS version: Android 6
• Device manufacturer / model: Nexus 5
• Cordova version (cordova -v): 9.0.0
• Cordova platform version (cordova platform ls): 8.1.0
• Plugin config
• Ionic Version (if using Ionic) N/A

Steps to Reproduce

Here's my scheduling code:

                id: 1,
                text: "text"
                priority: 2,
                foreground: true,
                trigger: {
                    every: {
                        weekday: 3,
                        hour: 10,
                        minute: 15
                    }
                }

I schedule several of these and nothing happens on Android 5 and Android 6. Works fine on Android 7, 8, and 9 and iOS.

Tried on three different phones.