Sometimes Homey is very very slow to move things over and the other way too - its slow to discover matter devices.
In my experience, delete it as a favourite, shut the apps down and try again.
Alexa isnt the best either and it can duplicate and lose devices / routines easily. Ive tried many times to discover devices and got nothing, only to find they auto added. Have a search around and check for typos!
Unless something new has broken recently, its been a pretty slow process all along.