The problem
[2.7.0-RELEASE][root@pfsense.provider.local]/root: pfSense-upgrade -d
ERROR: It was not possible to determine pkg remote version
Migrating /var/cache/pkg to ZFS dataset pfSense/ROOT/default/var_cache_pkg... done.
ERROR: It was not possible to determine pkg remote version
>>> Updating repositories metadata...
Updating pfSense-core repository catalogue...Solution
[2.7.0-RELEASE][root@pfsense.provider.local]/root: certctl rehash