Android alarm manager only repeats once after reboot

I'm trying to send a broadcast intent using alarm manager roughly every 60 seconds

I'm using the following function to set the alarm manager:

fun alarm(context: Context) {
        println("load alarms5")
        val alarmManager =
            context.getSystemService(Context.ALARM_SERVICE) as AlarmManager

        val alarmIntent = Intent(context, CheckAlarms::class.java).let { intent ->
            PendingIntent.getBroadcast(context, -1, intent, PendingIntent.FLAG_IMMUTABLE)
        }

        val calendar: Calendar = Calendar.getInstance().apply {
            timeInMillis = System.currentTimeMillis()
        }

        alarmManager.setInexactRepeating(
            AlarmManager.RTC_WAKEUP,
            calendar.timeInMillis,
            1000*60,
            alarmIntent
        )

        println("-alarm search-")
    }

If I use the function normally it sets the alarm correctly and I every 60 seconds or so the intent is sent.

But when I use the following function to set the alarm when the phone boots, the alarm manager only runs once without repeating, and the intent is only sent once.

class BootReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
    if (intent.action == "android.intent.action.BOOT_COMPLETED") {
        PlannerAlarmManager.alarm(context)
    }
}

Manifext:

<receiver android:name="pt.keeponcare.planner.BootReceiver"
        android:enabled="false"
        android:exported="false">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

This code runs when the app is opened:

context.packageManager.setComponentEnabledSetting(
        receiver,
        PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
        PackageManager.DONT_KILL_APP
    )