Federated fail: Trusted Servers all on Yellow, not Green

We currently have the nextcloud solution in different locations that are connected by MPLS, however we have not been able to put the federation into operation, since when federating the connection of servers they remain in yellow and not green, as would be the ideal.

Any ideas to solve this problem? Thanks.

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If you control both servers, you can check the database table oc_trusted_servers where you will likely see that shared_secret is NULL. To work around the issue, I was able to create my own generated shared_secret and place it in the NULL field on both ends, and then run occ federation:sync-addressbooks after which it turned green.

There is a bug report here