embedded app with flass cookie error

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Hello, I am trying to get it to work an embedded app with flask.
When I try to run it I get this error:

Unable to load the app due to a problem with cookies on the browser. Try enabling cookies on your browser, switch to another browser

I've enabled cookie on the browsers.

I get cookie error with any browser.

I don't know if it is only a problem with flask or there are other frameworks.

How to fix?