ARS - Replication status "unknown" / Publisher - Subscriber


I have two ARS servers and two DBs, configured one of the ARS servers and promoted it as Publisher.
I then added the second server as subscriber.

Both ARS servers 2016 are running under version, SQL servers are 2016.

In the ARS console, under "Configuration Databases" the replication status shows "Unknown" also in the properties of the DB under "Replication Status" tab, everything shows empty.
If I check the replication on the SQL box, it seems that the snapshot has been created successfully, therefore I think it should technically work?! Anyway, on the second ARS server, none of the configuration seems to be moved.

Just for my understanding, all MU, Access Templates etc. should be replicated to the second ARS server right?

Thanks for your help,

Following errors are shown in the SQL replication monitor:

The process could not connect to Subscriber 'subscriber'. (Source: MSSQL_REPL, Error number: MSSQL_REPL20084)
Get help: http://help/MSSQL_REPL20084

Login failed for user 'domain\publisher$'. (Source: MSSQLServer, Error number: 18456)
Get help: http://help/18456

The subscription to publication 'AelitaReplica' could not be verified. Ensure that all Merge Agent command line parameters are specified correctly and that the subscription is correctly configured. If the Publisher no longer has information about this subscription, drop and recreate the subscription. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147201019)
Get help: help/MSSQL_REPL-2147201019

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