Aggregate Relation Error when attempting to assign Postgres User Roles

I have been googling around and referencing threads like this one, but the suggestions in that thread are not solving the issue.

As Postgres user, ( hosted on AWS) I am attempting to GRANT all privileges on a Role that other users inherit from:

GRANT SELECT ON ALL TABLES in schema my_schema to player_one;

However I keep receiving this error:

ERROR:  permission denied for relation aggregate_primary

I was able to grant USAGE on my_schema to the player_one role, but I am now stumped when I am attempting to grant all privileges on that role.

Anyone have any ideas of what to troubleshoot next?