This thread is resolved. Here is a description of the problem and solution.
Problem:
The client added 'Filipino' as a new language and manually translated several pages including the homepage. However, the Filipino flag did not appear in the dropdown for the homepage, although it did for other pages.
Solution:
First, we advised the client to ensure that the homepage was fully translated to Filipino by checking the translation status in Pages>>All Pages. We suggested creating a test post in English, duplicating it to Filipino, and then checking if the language switcher worked as expected on this post.
Upon further investigation, it was found that the English homepage had not been translated into Filipino, but a new, separate Filipino homepage had been created. As a solution, we recommended linking the Filipino homepage with the English version after taking a backup, as described in our documentation: How to link already translated pages.
If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please do not hesitate to open a new support ticket at WPML support forum.
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This topic is split from https://wpml.org/forums/topic/i-may-need-to-add-an-additional-language-not-featured-in-wpml/