EONIA fixing value is not available since 2020-12-22.

df, err = ek.get_data(['EUROSTR=','EONIA='],['TR.FixingValue','TR.FixingValue.date'], {"Sdate": '2020-12-20',

"Edate": '2020-12-28'})

df

Instrument Fixing Value Date

0 EUROSTR= -0.557 2020-12-21T00:00:00Z

1 EUROSTR= -0.558 2020-12-22T00:00:00Z

2 EUROSTR= -0.559 2020-12-23T00:00:00Z

3 EUROSTR= -0.555 2020-12-24T00:00:00Z

4 EUROSTR= -0.553 2020-12-28T00:00:00Z

5 EONIA= -0.472 2020-12-21T00:00:00Z

6 EONIA= -0.473 2020-12-22T00:00:00Z

7 EONIA= NaN 2020-12-23T00:00:00Z

8 EONIA= NaN 2020-12-24T00:00:00Z

9 EONIA= NaN 2020-12-25T00:00:00Z

10 EONIA= NaN 2020-12-28T00:00:00Z