Hello @tbyro
Upon investigating the issue, I found that the REST API access seems to be disabled or limited for authenticated flows only.
Moreover, I noticed that XMLRPC is using an alternate endpoint, as the default appears to be throttled or limited in some way: https://floatmagazin.de/xmlrpc.php?for=jetpack.
Jetpack needs unhindered access to the xmlrpc.php file to function smoothly.
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To resolve this issue, kindly follow these steps:
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1. Make sure the REST API is enabled for your site and authentication is disabled. Alternatively, you can allow-list the?/jetpack/v4/?and?/wpcom/v2/?namespaces if you prefer. Your host should be able to help you with this.
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2. Ensure Jetpack’s XML-RPC access is unhindered. I’d suggest contacting your hosting provider and asking them to check their security logs for any blocked requests to the xmlrpc.php file on your site using the Jetpack by WordPress.com
user agent. You can also ask them to allow our IP addresses listed here: https://jetpack.com/support/how-to-add-jetpack-ips-allowlist/
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Once we can communicate with your site via the REST API and XML-RPC, please reconnect your site to Jetpack by following our guide here: https://jetpack.com/support/reconnecting-reinstalling-jetpack/#disconnecting-jetpack.
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Let us know how it goes!