Remco

Problem:
If you're experiencing issues where the ACF field link does not change domain when switching domains in a multi-domain setup with WPML and ACF, it might be due to the use of custom themes or incorrect configurations.
Solution:
We recommend checking the following:
1) Ensure that the pages you are linking to are translated.
2) Translate your posts and verify that the links show correctly in both languages.
3) If you are using ACF blocks instead of fields, be aware that there is a known issue with link translation inside ACF blocks. You can manually translate them via the WPML editor and ensure the link field is set to translate. Alternatively, you can try a workaround by making a small change to the default language and then re-translating the page. More details can be found here: WPML forum post.
If these steps do not resolve your issue, it may be related to custom code or themes. In such cases, we cannot provide support for custom solutions. You might need a developer to investigate further, and you can find qualified contractors at WPML Contractors.

Please note that this solution might be irrelevant if it's outdated or not applicable to your specific case. We highly recommend checking related known issues at WPML Known Issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML Support Forum.