Every Wix form gives this error

Hello,
I don’t know what happened, but now every old, and newly created wix-form yields an error like this when clicking the ‘submit’ button.

form submit failed with: TypeError: Failed to fetch

In the developer tools it gives this error:

Access to fetch at ‘https://www.thethreecantos.org/_api/wix-forms/v1/submit-form’ from origin ‘https://41951d19-edf6-4943-a101-2c290103c067.dev.wix-code.com’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

form submit failed with: TypeError: Failed to fetch
e.@ console.js:35

I have not changed anything related to databasing. What should I do?

Many thanks for your assistance!

You mention Wix Forms, so please note that Wix Forms is a Wix app and not part of Wix Corvid and your issue is not code related for which this Corvid Forum is for.
https://support.wix.com/en/ascend-by-wix/wix-forms

If you have simply used Wix Forms app with no additional code on your website, then your issue is not code related and you should be going through Wix Support instead.
https://support.wix.com/en/about-wix/contacting-wix-support

If you have used code with your Wix Forms app, then please post whatever code you have used so that we can see what you have added to the Wix Forms app itself.