I do have my attempted replacements in System Preferences / Keyboard / Text.
None of them work, including omw (it should have happened there!)
I don't know when the fault started but it could have been when I last did a standard OS update.
I wonder if there is another setting elsewhere that...
Replacements used to work OK but now they do not. Why?
(e.g. when I typed meb the software inserted my email address: stephenbs3@yahoo.co.uk )
I'm on version 10.11.6.