The reason for the broken link error is because of the .httpassword authentication requirement to view that image. You’ll see the prompt to log in if you try that image URL in a different browser.
If you remove the .httpassword requirement, the form can validate that URL. You could also swap in this other URL in for the time being:
The support post ‘That URL seems to be broken. Please enter a valid URL (2)’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.