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I am not sure if I have understood your question correctly.
Do you want us to check the thank you message you have set in your form? I did check your last edited form "Membership Application Form" and you seems to have configured the thank you message correctly. I also sent a test submission and the thank you message was displayed correctly. Please check the screenshot below:
Have you embedded your form in any webpage? Please share the webpage URL and we will take a look.
We will wait for your response.