Hi Steve,
The message indicates that the feature is deprecated but will still function as intended, however it will be removed from a future version of PHP so the Action will need to be updated.
With regards to your website right now, this doesn’t need to be changed. If this message was presented to the client after submitting the form though, it probably also prevented redirecting to the success page.
These types of messages should generally be hidden from visitors and instead recorded in log files, partly because they can cause issues like preventing redirects but also because they can expose information about the backend which may be useful for potential attackers.
If you can’t find a setting for it, you could contact the hosting provider about hiding PHP errors/warnings and other notices from visitors.
Simon
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