unable to install or upgrade packages via pkg after Upgrade to pfSense Plus

[sysadminfromhell]

Hello everyone,

since I swtiched my appliance from a fixed Box to a own build SuperMicro Server yesterday I cannot Install or Upgrade packages via CLI with PKG.
I still have the "upgrade to pfSense Plus" in the Update section and also have the following error when I try to Upgrade / install via PKG:

pfSense-upgrade -d -c
ERROR: It was not possible to determine pkg remote version
>>> Updating repositories metadata...
Updating pfSense-core repository catalogue...
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-core/meta.txz: Bad Request
repository pfSense-core has no meta file, using default settings
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-core/packagesite.pkg: Bad Request
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-core/packagesite.txz: Bad Request
Unable to update repository pfSense-core
Updating pfSense repository catalogue...
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01/meta.txz: Bad Request
repository pfSense has no meta file, using default settings
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01/packagesite.pkg: Bad Request
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01/packagesite.txz: Bad Request
Unable to update repository pfSense
Error updating repositories!
ERROR: It was not possible to determine pfSense remote version
ERROR: It was not possible to determine pfSense-base remote version
ERROR: It was not possible to determine pfSense-kernel-pfSense remote version

Is there a problem with my Installation or with the PKG Servers of pfsense? If I try to open the URL via browser I get a certificate error and the 400 SSL Certificate required.

Kind regards,