SET multiple role simultaneously in postgres using row level security (Tenant basis)

Description: I am using NestJS with a postgres database. I have applied Row Level Security(RLS) in the database table. As I have the requirement that the project will be on the tenant basis. RLS has been implemented successfully. I have followed the following guidelines to implement the RLS.

https://www.postgresql.org/docs/current/ddl-rowsecurity.html

https://www.postgresql.org/docs/current/sql-createpolicy.html

https://www.enterprisedb.com/postgres-tutorials/how-implement-column-and-row-level-security-postgresql

https://aws.amazon.com/blogs/database/multi-tenant-data-isolation-with-postgresql-row-level-security/

I have created the role for each tenant using the query:

getConnection().query(`CREATE USER "` + id + '";');

This query creates the user in the database. Also when I set the role in the database :

getConnection().query(`SET ROLE "` + id + '";');

RLS is performing well . It output the data of tenant whose role has been set in the database by command line query and also in the application.

Each tenant will have their own sub-domain but under the same database, their data is separated on the row level basis. The problem I am facing is I cannot set multiple role simultaneously. Suppose 'A' tenant logged into his sub-domain a.xyz.com then 'A' role is set in the database and when 'B' tenant logged in his sub-domain b.xyz.com, B role is set in the database. After B access the feature then 'A' is logged out automatically.