JSON Extract JSON in Metabase SQL

i have this table

i am trying to extract the value after underscore i.e 14454878

i tried extracting the keys using this query on metabase

select id, outgoing,
       substring(key from '_([^_]+)$') as key
from table,
cross join lateral jsonb_object_keys(outgoing) as j(key); 

but i keep getting the error

ERROR: function jsonb_object_keys(json) does not exist Hint: No function matches the given name and argument types. You might need to add explicit type casts. Position: 129

Please help

The column is defined as json but i used a function that expects jsonb. so i changed Use jsonb_object_keys() to jsonb_object_keys()

select id, outgoing,
       substring(key from '_([^_]+)$') as key
from table,
cross join lateral json_object_keys(outgoing) as j(key);