SMS texts not syncing between iPhone and Macbook Pro & iPad

Hi there,

I've been having SMS problems between my iPhone, which receives SMS messaging fine, and my Macbook + iPad Pro. To be clear: I am having no issues with iMessage, only with SMS.

For the past 2-3 months, I have intermittently had an issue where my iPhone would receive SMS messages, but my iPad and Macbook would not receive it. Each time, I would frustratingly look up help articles and solve the problem. I'm not sure exactly what it was that worked, but I think it was turning text message forwarding off and then back on plus restarting my phone. That seemed to nip the problem in the bud.

The issue above happened about 3 times in the past 3 months. Each time, enough time passed between the issue that I forgot how to solve it. Between solving it, things would work fine again....until it stopped working fine.

This has been frustrating.

Well now I'm currently experiencing a new, frustrating situation. Right now, all 3 devices are receiving text messages. The issue is that when I read an SMS text message on my iPhone, both the iPad and Macbook do not mark it as read. I have to manually open the SMS on my iPad or Macbook as well to get them to mark as read. (The Macbook and iPad are syncing together, though. So when I read an unread SMS on my iPad, it marks as read on my Macbook.)

What can I do?