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Problem:
You are trying to add Alt Text to the flags on your site but cannot find an option to do so in the backend, and there is no relevant information in the documentation.
Solution:
We recommend checking our official errata page for information about the missing alt attribute on flag images in language switchers. You can find detailed guidance here: Missing Alt Tag for Flag Image in a Language Switcher.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. If you still need assistance, please open a new support ticket at WPML support forum.