ORA-01691: unable to extend lob segment ABC.SYS_LOB0000167347C00131$$ by 1024 in tablespace XYZ

select file_id, bytes, maxbytes from dba_data_files where tablespace_name = 'XYZ';

alter database datafile 15 autoextend on maxsize 20G;

alter tablespace xyz add datafile '/path/to/datafiles/xyz02.dbf' size 100M autoextend on next 100M maxsize unlimited;