Provided the content is different, hreflang should fix it. However, there have been several discussions in Google support forums that sometimes Search Console may display an error but correct language pages for appropriate users will still show in search results due to hreflang tags. support.google.com/webmasters/thread/5720658/… After implementation give Google some time. If error persists, you can do a location based testing to find if hreflang works to display correct results despite search console errors.
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Comment by Kannan on Google-selected canonical is my original site rather than my multilingual site
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