NC not reachable from iOS using FRITZBox VPN connection

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Well, I’m trying to connect to my Nextcloud from another network. I’m using the default integrated VPN client on my iPad and it connects me to my home network.
When I try to connect to my Nextcloud (running on a Raspberry Pi 4) it gets stuck in the process of loading and after a minute or two it tells me that the server does not respond anymore. I can access the server from my local network without problems. Does anyone know if either my VPN or the cloud is blocking the connection?
EDIT: There are no errors or something similar in the logs or anywhere else…

Again, if you want help, deserve it. The support form is here to give us information about your “server” and version in order to helping you …

Without it, it is like asking a blind pilot to run a F1 car…

I can’t guess anything on your PI…