default privileges are npt working

Hi,

I have a postgres instance running on version 15 in centos7.

I have created a custom database and revoked all public privileges from
that database.

Then I have created a custom schema in that custom database.

Now I have created one writer *user* and one reader *user *by postgres
superuser and then granted connect privileges on the database.

Then I have given all privileges of schema level and table level to the
writer *user *so that it can create tables and insert data in the tables in
that schema.

And for reader *user * I have granted usage only privileges on schema level
and select privileges on table level so that it can only read the data of
tables.

Then I granted default "select" privileges to reader *user *to read data of
all tables created by writer *user* using below command:

alter default privileges in schema <custom schema> grant select on tables
to <reader user>.

but when I am connected to the reader user I am not able to read the data
inserted by the writer *user* and getting permission denied error.

I can only see the list of tables created by the writer user, not the data.

Am I missing something here? Please let me know.

*My Goal: To read the data by reader user inserted by writer user.*

Regards.