The myopenhab.org service only supports one instance of OH at a time. Similarly, the Android app currently only supports one OH instance at a time (they are adding support for more OH instances to the Android app I think).
You have several options.
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Set up a VPN so that all the OH instances can see each other. Set up MQTT 2.5 Event Bus and configure all the OH instances to funnel all the alerts to a single OH instance. That OH instance then generates all the push notifications.
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Use an alternative push notification service like Telegram. If your push notification service of choice doesn’t have a native Oh binding, MQTT Warn is a separate little
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Use the Mail binding and issue alerts over email. Many phone providers offer an email to SMS gateway which you could use to send SMS messages via email.