HELP with adding Di2 rear derailleur

[MoabC&J]

I have a Da Vinci Symbiosis e-assist mountain tandem with a Shimano EP8 motor. I have a 1 x 11 drive and I'm trying to add a Di2 rear derailleur. After I connected my derailleur to the motor and the left assist switch and right shifter switch I get an Error Code E-030. If I disconnect the derailleur and start the battery again the E-030 goes away. I need HELP with what part(s) are not playing nice together.
Here is my parts list:
Motor - EP8
Derailleur - RD-M8050
Cycle Computer - SC-EM800
Shifting Switch - SW-E7000-R
Assist Switch - SW-EM800-L

One person suggested the Assist Switch - SW-EM800-L might be the problem and to replace it w/ a SW-E7000-L

What am I missing or messing up here?

 

[braaten22]

Hello you need to go to a shimano service center who could help you program your drive unit and set it to electric shifting

 

[MoabC&J]

Do you t

Hello you need to go to a shimano service center who could help you program your drive unit and set it to electric shifting

Do you think the eTuning app with the full license will let ME do that? We are a long way from a Shimano service center.

 

[Zimmerframe]

Stunlocker used to let you enable di2, haven't used it for a long time though ..

@vadII ?

 

[vadII]

Stunlocker used to let you enable di2, haven't used it for a long time though ..

@vadII ?

Yes, STUnlocker supports that. The premium license is not required.
p.s. The firmware downgrade is required to make changes.