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I have checked form that you provided and it is working fine on my end.
Are you still getting form unavailable message? Is exact message "This form is currently unavailable!"? This message will be shown when form is disabled due to Submission Limit set on the form. I have inspected form you provided on your account and your form is enabled. Were you able to resolve your issue?
If not please provide us a screenshot of message that is shown on your end. In case that your form is embedded, please provide us URL of your webpage.
Let us know if you need further assistance.