This thread is resolved. Here is a description of the problem and solution.
Problem: The ""Incorrect hreflang implementation" error is displayed on the Google Console.
Solution: See the source code of your website and verify that the hreflang tags are correct.
If you have made changes recently on your site, wait a few days until Google re-index your site.
Relevant Documentation: https://support.google.com/webmasters/answer/189077?hl=en
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