> Sense code 084E - IBM Documentation
> <https://www.ibm.com/docs/en/zos/2.1.0?topic=reject-sense-code-084e>

That's for LU6.2.  What are your terminals, I thought they were 3270s?

https://www.ibm.com/docs/en/search/3270?scope=SSLTBW_2.4.0&tag=istprg0

https://www.ibm.com/docs/en/zos/2.4.0?topic=system-types-3270-terminals

Types of 3270 terminals

The following types of 3270 terminals are directly supported by VTAM®
in its domain:

SNA 3270 terminals:
     
Local (PU type 2)

    3270 terminal attaches to a PU type 2 cluster controller, which
    in turn attaches to the VTAM host processor by a System/370
    channel. Example: 3278 Display Station on 3274-1A Control Unit.

Remote SDLC (PU type 2)

    3270 terminal attaches to a PU type 2 cluster controller, which
    in turn attaches by an SDLC link to a communication controller
    containing an NCP, or directly to a processor through a communication
    adapter. Example: 3278 Display Station on 3276 Control Unit.

Remote SDLC (PU type 1)

    3270 terminal attaches to a PU type 1 cluster controller, which
    in turn attaches by an SDLC link to a communication controller
    containing NCP, or directly to a processor through a communication
    adapter. Examples: 3288 Line Printer on 3271-12 Control Unit or a
    3767 terminal.

Non-SNA 3270 terminals:
     
Local

    3270 terminal attaches to a non-SNA cluster controller, which in turn
    attaches to the VTAM host processor by a System/370 channel. Example:
    3277 Display Station on 3272 Control Unit. A 3270 terminal attached
    to a 4331 Display/Printer adapter also presents this appearance.

Remote BSC

    3270 terminal attaches to a non-SNA cluster controller, which in turn
    attaches by a BSC link to a communication controller containing NCP,
    or directly to a processor through a communication adapter. Example:
    3286 Printer on 3271-2 Control Unit.

In addition, VTAM supports sessions between application programs in the
VTAM host processor and 3270 terminals in another domain in which each
cross-domain terminal provides the appearance of one of the types of
3270s listed in the preceding discussion.

You have 3 R6's?:

DMHREG   EQU   R6 
VTAMREG  EQU   R6
         LR    R6,R1                   LOAD DYNAMIC SESSION  
         LA    R8,INITVTAM             LOAD INIT MODEL       
         LHI   R9,INITVTAL             LOAD INIT MODEL LENGTH 
         MVCL  R6,R8                   COPY INIT MODEL SESSION 

I'm totally lost on your register usage and which using's are in effect.

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