Sometimes, after creating CloudPages in the past, a message saying an error occurred can be encountered. This will be displayed with a spinning wheel after clicking Save on the Create Content screen.
This likely means that the Site Key is being re-used. If a Site Key is re-used after a previous page using the same key has been deleted, this error prompt will occur. To avoid this error in the future, if you are going to re-use a Site Key, ensure that you change the said key or append text to the key prior to deleting it.
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