Postgres support for UUID

My understanding is that Postgres supports UUID data type out-of-the-box. I'm running Postgres on Amazon RDS with Engine version 10.6 and am scratching my head as to why the following commands are not behaving as expected:

CREATE TABLE IF NOT EXISTS "Tenants" 
(
    "id" UUID NOT NULL , 
    "domain" VARCHAR(255) NOT NULL UNIQUE, 
    "name" VARCHAR(255) NOT NULL, 
    "schema" VARCHAR(255) NOT NULL UNIQUE, 
    "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL, 
    "updatedAt" TIMESTAMP WITH TIME ZONE NOT NULL, PRIMARY KEY ("id")
);

The critical part here is that I'm creating "id" UUID NOT NULL. So far, so good. Or so I thought. Next, I'm trying to add an entry:

INSERT INTO "Tenants" ("id","domain","name","schema","createdAt","updatedAt") 
VALUES 
(
    '3b6b220b-2690-4279-8343-cbe6167f7596',
    'test1.stage-domain.io',
    'Test1','test1',
    '2019-02-25 14:29:33.475 +00:00',
    '2019-02-25 14:29:33.475 +00:00') 
RETURNING *;

and surprisingly the following error shows up: > SequelizeDatabaseError: invalid input syntax for integer: > "3b6b220b-2690-4279-8343-cbe6167f7596 Sure enough, if I go to PGAdmin, I'm seeing that the column has not been set to UUID, rather it has been set to an integer: The dropdown shown in this picture does not even contain a UUID type. The weirdest part is that I created a different Postgresql server on RDS last night and everything actually worked just fine in that instance. **My question:** How can I get my database to recognize the UUID type when creating the Tenants table?