Authorization error running db2 command line with db2inst1

I need to enable the COLUMNAR setting in DB2 Express Edition on Docker. For that to work I need to set INTRA_PARALLEL ON at the instance or database level.

I connect to the db2 command with db2inst1 that is the instance owner, but I’m getting an error saying that the user is root. How to fix this problem?

db2 => connect to bank0002 user db2inst1 using xxxxx     Database Connection Information   Database server        = DB2/LINUXX8664 11.5.4.0  SQL authorization ID   = DB2INST1  Local database alias   = BANK0002  db2 => UPDATE DBM CFG  USING INTRA_PARALLEL ON SQL5001N  "ROOT" does not have the authority to change the database manager  configuration file.