Wordpress admin ajax return 504 error

Hello, I have created a custom form and added Google sheet API, Hubspot, and Aweber API for it, so and the problem is that when I use only Hubspot and Google API form works correctly. Still, after submitting the form to AWeber I get a 504 error I don’t know why…

<a href="https://prnt.sc/X0wKjq8lx4q0">screen</a>

Please check this community tip about this error: 504. It provides some suggestions and links to further reading about this and similar errors that occur between your origin and third-party servers.

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