Google console emailed me a msg. I click on the link and show, there are plenty of "no return tags" errors. My site is targeted globally, so I haven't selected a country to target.
I have no idea what else do to as I have removed all my hreflang tags. A few days back I was trying to test this return tag thing and after a week or two I removed all the codes. As you can see the crawl date is a month old, so I asked the google to recrawled the urls.