pg_restore ERROR: permission denied to change default privileges

I have a pg_dump from a postgres instance that I am attempting to restore onto a cloud one (i.e. an instance where I don't have access to the postgres superuser)

The dump was taken with:

pg_dump -Fc --quote-all-identifiers --serializable-deferrable --no-unlogged-table-data my_database > my_database.dump

I am attempting to restore it using the proxy admin user provided by the cloud provider:

pg_restore -d "host=foobar.example.com port=12345 user=my_cloud_admin_user sslrootcert=/path/to/the/cert.crt sslmode=require dbname=my_database" -O -1 my_database.dump

This is the error I am seeing:
pg_restore: error: could not execute query: ERROR:  permission denied to change default privilegesCommand was: ALTER DEFAULT PRIVILEGES FOR ROLE "postgres" IN SCHEMA "public" GRANT SELECT ON TABLES TO "my_database_ro";

N.B. "my_database_ro" being a user that was on the original database, and was successfully created in the new database by restoring a "pg_dumpall --globals-only" into the new database before attempting the pg_restore