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Problem:
The client's staging site was showing as unregistered and unable to save the site key, while the QA environment on the same VM was functioning correctly. The client was concerned about a potential block from WPML's side affecting their staging environment.
Solution:
We first asked the client to check if there were any red X icons in the WPML > Support > Installer support section, which would indicate a connection issue to the WPML API. Upon confirmation of a red X, we recommended whitelisting the following domains with their hosting provider's help:

• wpml.org
• cdn.wpml.org
• api.wpml.org
• api.toolset.com
• cloudfront.net

For more detailed steps, we directed the client to our documentation: WPML plugin cannot connect to WPML.org

If this solution does not resolve the issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent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. If further assistance is needed, please open a new support ticket at WPML support forum.

Problem:
You are working on a development site and encountering an issue where certain links do not fall back to the default language on the German version of the page, resulting in a 404 error. Some links like 'ASTM C365' correctly fall back, but others like 'ASTM C109' and 'ASTM C170' do not.
Solution:
We recommend you apply the following workaround to address the fallback issue:
1. Edit the file at

/wp-content/plugins/sitepress-multilingual-cms/classes/query-filtering/class-wpml-query-parser.php

2. Replace the code on line 419 with:

$requested_page = get_page_by_path($q->query_vars['name'], OBJECT, $first_post_type);

3. After line 458, add a new function to handle the page path and post type processing more effectively. This function also includes improved caching mechanisms and SQL queries to ensure correct page retrieval based on the language settings.

After implementing these changes, please verify if the language switcher functions as expected.

If this solution does not resolve your issue or seems irrelevant due to updates or differences in your setup, 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 problems persist, please open a new support ticket.