messages does not receive or send green bubble messages

doelm wrote:

My messages will not send or receive green bubble messages, tells me not delivered, but only from my iMac, my iPad and MacBook are fine and they receive and send green bubble messages.

It sounds as if, somehow, Text Message Forwarding has gotten turned off for your iMac. On your iPhone, go to Settings>Messages>Text Message Forwarding and make sure that your iMac is selected.

See also:

Forward SMS/MMS text messages from your iPhone to other devices - Apple Support

If you have issues with Messages after you set up a new device

If you experience issues like conversations in Messages showing up as separate threads or sent messages appearing as green message bubbles instead of blue message bubbles when you set up a new device, update your settings using the following steps:

1. Update your device to the latest version of iOS or iPadOS if needed.
2. In the Settings app, tap Cellular. Make sure that your phone line is turned on. If you use multiple SIMs, make sure that the phone number you want to use is selected and turned on.
3. In the Settings app, tap Messages. Turn iMessage off and then back on.
4. Tap Send & Receive.
5. Tap the phone number that you want to use with Messages.

If you have issues when you try to receive a FaceTime call after you set up a new device, you can also update your FaceTime settings.

Learn what to do if you can't sign into iMessage or FaceTime

Learn what to do if your messages are green

Learn what to do if you see a Waiting for Activation alert