External Access not working (DDNS / No-IP)

I am trying to set up a Nextcloud on a Raspberry Pi 4. Up until now everything is installed and I can access the Cloud in my home network without problems. As a next step I want to enable external access via DDNS (No-IP), which is not working.

In order to do so I created an account on noip.com and selected a subdomain for DDNS. My router, which is a TP-Link already supports DDNS via noip.com.

Next up I freed the ports 80 & 443 for my nextcloud via port forwarding.

Now when I go to my nextcloudpi config panel and try to activate no-ip, I get the following:

[ no-ip ] (Sun Jun 21 13:47:50 BST 2020)

Auto configuration for Linux client of no-ip.

Only one host is registered to this account. It will be used.

New configuration file ‘/usr/local/etc/no-ip2.conf’ created.

Failed to enable unit: Unit /run/systemd/generator.late/noip2.service is transient or generated.
System config value trusted_domains => 3 set to string denkibob.ddns.net
System config value overwrite.cli.url set to string https://denkibob.ddns.net/
noip DDNS enabled

This is my System Info:

System Info

‣ You should run Lets Encrypt for trusted encrypted access

NextCloudPi version v1.26.2
distribution Raspbian GNU/Linux 10 \n \l
automount yes
USB devices sda
datadir /media/myCloudDrive/ncdata
data in SD no
data filesystem btrfs
data disk usage 463M/15G
rootfs usage 2.2G/29G
swapfile /var/swap
dbdir /var/lib/mysql
Nextcloud check ok
Nextcloud version
HTTPD service up
PHP service up
MariaDB service up
Redis service up
Postfix service up
internet check ok
port check 80 open
port check 443 open
interface eth0
certificates none
NAT loopback no
uptime 19:26

I really have no idea why I still can’t access my nextcloud from outside of my home network and am thankful for every suggestion in advance!