Combine data from two tables

If I use join then I lose data because I join on both date and name. But some data only exists in left or right. I expect to use an outer join then, but I can't get it correct.

I have this for test
CREATE TABLE [dbo].[TableA](
[date] [date] NOT NULL,
[name] [nchar](10) NOT NULL,
[a] [int] NOT NULL,
CONSTRAINT [PK_TableA] PRIMARY KEY CLUSTERED
(
[date] ASC,
[name] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[TableB](
[date] [date] NOT NULL,
[name] [nchar](10) NOT NULL,
[b] [int] NOT NULL,
CONSTRAINT [PK_TableB] PRIMARY KEY CLUSTERED
(
[date] ASC,
[name] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


insert into TableA(date, name, a) values(GETDATE()-2, 'lorem', 1), (GETDATE()-1, 'ipsum', 1),(GETDATE()-1, 'dolor', 1);
insert into TableB(date, name, b) values(GETDATE()-1, 'dolor', 2), (GETDATE(), 'sit', 3);

select date, name, sum(a) as a, sum(b) as b
from
(
select date, name, a, 0 as b
from TableA
union
select date, name, 0 as a, b
from TableB
) as t
group by date, name

It gives this result.
date name a b
2023-09-25 lorem 1 0
2023-09-26 dolor 1 2
2023-09-26 ipsum 1 0
2023-09-27 sit 0 3

Note that row 2023-09-25 'lorem' only exists in TableA, and therefor is "0" in column b.
Note that row 2023-09-25 'dolor' exists in both, and therefor have data in both column a and b.
Note that row 2023-09-27 'sit' only exists in TableB, and therefor is "0" in column a.