Hey @Romain_Bisseret,
The issue here is arising because your hosting provider has disabled a PHP function called libxml_disable_entity_loader, which is used in the WP Discourse plugin.
That function is used in a wide variety of Wordpress plugins, and is fully supported in PHP 7.*, however it has been deprecated in PHP 8.0. We’ll be deprecating it in the WP Discourse plugin in the near future, alongside other work to ensure full compatability with PHP 8.0; in fact, I’m pushing that up my todo list.
Could you confirm:
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The version of the PHP you’re using (sorry I wasn’t clear by your reference to PHP 7 if you mean that’s the version you’re running)
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Your hosting provider. It may be worth asking them about enabling this on your instance(s). The function is a supported function in PHP 7.*.
Thanks.