I'm running High Sierra on my iMac, and whenever I try to send a text to an Android user from Messages, it errors out telling me the phone number isn't registered with iMessage. This just started.
iMac Line (2012 and Later)
Hi Mitch, you can't send a iMessage if the person you want to sent the message don't have an Apple device
If you want a text message from your Mac, you will need to have an iPhone and to activate text message forwarding on your iPhone
Here is the procedure to follow : https://support.apple.com/en-us/HT208386
Let me know if you have any difficulties
Best regards
iMessage Won't send to Android from Mac
