This thread is resolved. Here is a description of the problem and solution.
Problem: I am getting this Sistrix error about missing hreflang on my website. --Sistrix Error--- Hreflang back-link is missing The destination page for the Hreflang link does not contain the reverse links. Solution: The cause of the issue is the hreflang setting in WPML -> Languages -> Edit Languages.
To solve the issue you need to change the hreflang value for German from "de-DE" to "de" - Do the same for all the other installed languages (eg. "en" instead of "en-US") Relevant Documentation: https://wpml.org/documentation/support/adding-hreflang-wordpress/#check-your-hreflang-settings-and-make-sure-they-are-as-you-intend-them-to-be
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