Msg 142, Level 15, State 2 -- Can't figure out what I have wrong
Move the CONSTRAINT DEFAULT next to the field definition:

CREATE TABLE Accounts.AdminUsers ( admID             INT              NOT NULL    IDENTITY(1,1)
                          , admFN            VARCHAR(35)      NULL
                          , admLN            VARCHAR(35)      NULL
                          , admUserName  VARCHAR(64)      NOT NULL
                          , admPass      VARCHAR(128)     NOT NULL
                          , admPassIV        VARCHAR(32)      NOT NULL
                          , admPassResetDate DATETIME2    NULL
                          , admEEID      VARCHAR(30)      NULL
                          , admEmail         VARCHAR(255)     NULL
                          , admAcctEnabled   BIT              NOT NULL CONSTRAINT DF_Accounts_AdminUsers_admAcctEnabled 
                            DEFAULT (1)
                          , admHier      HIERARCHYID      NOT NULL
                          , admNumLogins     SMALLINT         NULL
                          , admLastLogin     DATETIME2    NULL
                          , admCreateTS  DATETIME2    NOT NULL CONSTRAINT DF_Accounts_AdminUsers_admCreateTS 
                            DEFAULT (CURRENT_TIMESTAMP)
                          , admTID       TINYINT          NOT NULL
                          , CONSTRAINT PK_Accounts_AdminUsers
                            PRIMARY KEY CLUSTERED (admID)
                          );