Can't select confirmation page, only a few pages available

When trying to select a confirmation page I only see 5 pages in the selection window. Using the search I can sometimes find the page I want, but not always.

I am currently trying to add a page, but it is not showing up, even when searching.

I’ve switched off all caching and everything in the site is up to date.

Hello. The dropdown is populated with pages from the site using the WP REST API. If that is disabled or blocked, this can happen. It could also be from a theme or plugin conflict.

To see is the REST API is responding properly, try loading this page in a browser (with your URL rather than example.com):

https://example.com/wp-json/wp/v2/pages

If you get a JSON response, the API endpoint is available. If that is OK, the next step will be to perform a conflict test:

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