The procedure in my post is only for use if your server hasn't noticed an account, thread or group. It's meant as a last resort rather than first resort.
It's mainly useful for groups or accounts that are very new and haven't been noticed by many servers yet.
Servers cannot instantly notice every post and every account from every other server, it would be horrifically expensive and drive the Fediverse into the hands of big tech:
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.