Zend certified PHP/Magento developer

Google Recaptcha seems not to work on Magento 2.4.2

I tried now a lot of times on two magento2 instances to enable the google recaptcha function.

I followed these instruction:

https://docs.magento.com/user-guide/stores/security-google-recaptcha.html

Website is:

https://goldschmiede-jaqueline.de

The Google Recaptcha symbol appears but I can put any cryptic mails i.e. in the newsletter and it goes through.

I also enabled the required php setting
allow_url_fopen = On (1)

This is the google admin console for recaptcha.
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These are the magento2 settings
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My question is how to debug this issue and am I wrong that cryptical emails could be set after enabling the recaptcha?? Has anyone the same issue?

UPDATE:
The V2 with “I am not a robot” works but the V3 invisible in the footer of the newsletter not.

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