I know there are lots of discussions on this, but I can't find a solution to this:
iMessage on Mac won't send to phone numbers I know to be registered with iMessage
you can see iMessage even says it is an iMessage number!
You may need to add the country code to the phone number to get it to work. Try sending in the Safe Mode.
Safe Mode - About El Capitan
also Sierra
Safe Mode Startup – El Capitan. also Sierra
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.
iMessage won't sent to phone number
