Reaching DB2 using db link via OTG throwing an error

Hello, any idea what could be throwing the error below? We are trying to reach DB2 via DB link thourgh OTG. The DB ver is 19.20 on RHEL 7.

The link:

DB2I21.WOB.VW.VWG

(DESCRIPTION =

 (ADDRESS = (PROTOCOL = tcp)(HOST = lxf102p1273.wob.vw.vwg)(PORT = 1532))

 (CONNECT_DATA = (SID = db2i21))

 (HS = OK)

 )

Error:

Error 28500 trapped in 2PC on transaction 30.22.143605. Cleaning up.

Error in cleaning up 2PC subordinates; error stack:

ORA-28500: connection from ORACLE to a non-Oracle system returned this message:

[Oracle][ODBC DB2 Wire Protocol driver]Connection dead. {HY000,NativeErr = 1208}

ORA-02063: preceding 2 lines from DB2I21.WOB.VW.VWG

ORA-28500: connection from ORACLE to a non-Oracle system returned this message: