SQL0204N "DB2ADMIN.TA" is an undefined name. SQLSTATE=42704
DB2 (as other standard-compliant SQL databases) converts unquoted identifiers to uppercase, so when you say select * from db2admin.ta DB2 will look for the table named 'TA' in the schema 'DB2ADMIN'. That's exactly what the error message tells you.

According to the SYSCAT.TABLES query results, you have created your table and schema with lowercase names. To access them you will need to quote both identifiers (separately):

select * from "db2admin"."ta"


Note the double quotes.