I too have that issue, so I managed to rollback to 2.6.0 as it was a VM via a snapshot.
I am now, unable to update any packages, see any packages, checking for 2.6.0 updates says I am on the latest version.
When I got to register for pfsense Plus again, it say is already registered, but now when I select the pfSense Plus upgrade option, I get an error:
Retrieving: Unable to check for updates:
SSH says:
/root: pfSense-upgrade -d -c
>>> Updating repositories metadata...
pkg-static: Warning: Major OS version upgrade detected. Running "pkg bootstrap -f" recommended
Updating pfSense-core repository catalogue...
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-core/meta.txz: Authentication error
repository pfSense-core has no meta file, using default settings
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-core/packagesite.pkg: Authentication error
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_01_amd64-core/packagesite.txz: Authentication error
Unable to update repository pfSense-core
Updating pfSense repository catalogue...
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01//meta.txz: Authentication error
repository pfSense has no meta file, using default settings
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01//packagesite.pkg: Authentication error
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
Could not load client certificate /etc/ssl/pfSense-repo-custom.cert
pkg-static: https://pfsense-plus-pkg00.atx.netgate.com/pfSense_plus-v23_01_amd64-pfSense_plus_v23_01//packagesite.txz: Authentication error
Unable to update repository pfSense
Error updating repositories!
ERROR: Unable to compare version of pfSense-repo