Hello. I really hope you can help with this issue. I came across an instance of someone with a similar problem (albeit with a different theme, https://wordpress.org/support/topic/google-says-hreflang-tags-are-missing/), but wonder whether the issue might be down to the specific theme (Perth).
My website is multilingual as my main clients are the Russian- and German-speaking markets.
I am currently using the Polylang plugin, which works very well with the theme (although I can confirm that issue raised under this thread https://athemes.com/forums/topic/installing-polylang-removes-content-of-home-page/ is also true).
Is there anything that can be changed in the theme’s head section or otherwise that might help rectify the problem of “incorrect hreflang implementation”?
The thing is that the links for the different languages work both ways in all languages.
This is the full message from Google:
“Google has detected that some pages on your site have implemented the rel-alternate-hreflang tag incorrectly. In particular, there seems to be a problem with incorrect language and region codes, or incorrect bi-directional linking (if page A links with hreflang to page B, there must be a link back from B to A as well). Google uses the hreflang attributes to serve the correct language or regional URL to the right users in search results.”