Issues with new PayPal Checkout plugin

[audiorock]

I solved the problem by activating the "cross-origin-opener-policy" in the HTTP Header plugin as shown in the figure.

This solution may be useful to some other users

Bye Bye.

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[TheThingIs]

Interesting.

That plugin is disabled on an upgrade J3 to J4, and it is enabled on new installations of J4, do you have the same error with the plugin disabled?

[audiorock]

Interesting.

That plugin is disabled on an upgrade J3 to J4, and it is enabled on new installations of J4, do you have the same error with the plugin disabled?

these parameters could also be present on the server side (.htaccess)
these configurations concern http headers
If the plugin is deactivated and you still encounter the problem, check the server side.