Group messages do not work after switching to S9 from Iphone

[Android Central Question]

I just traded in my IPhone and got the Galaxy S9. My wife and kids still have the IPhone and now I can't receive group messages from them. They are able to receive my messages but I can't receive theirs. I no longer have access to the IPhone but did log on to the deregister website to deregister my Imessages but that didn't fix the problem. Any ideas? The settings show I have group messaging activated

 

[hallux]

There is a step you missed. They (or you) need to start a new group message. The previous one has you registered as an iMessage user, not as a regular SMS, so the iPhones are still using the Messages protocol for that previous group "text" which can't deliver to your S9.

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[RumoredNow]

Have a look: https://gigaom.com/2014/05/14/stuck-in-the-imessage-abyss-heres-how-to-get-your-texts-back/