Error when using "Box" Plug-ins

Dear anyone,

I am currently trying to execute Box API that uses JWT,

But the following issue occurred when executing the Box API to obtain an access token.

If someone else has sent about the same issue and it has been resolved,

or alternative solutions you may suggest would be highly appreciated.

[Error details]　*This is written in the body of the HTTP response.

"{"error":"invalid_grant","error_description":"Please check the 'box_sub_type' claim. The value for 'box_sub_type' is invalid"}"

[Procedure]

1.Obtain a JWT using the createtoken() function of the “Box” Plug-ins.

2.Execute the Box API to obtain Box's Access Token.   *An error occurs here.

[Already Confirmed]

1.Applications created in Box have been approved by the Box administrator.

2.'box_sub_type' and 'sub' classifications must match.

Thank you very much in advance for your assistance.

Best regards,

・HTTP Responese

・Component of  Procedure 1 (ExpressionRule)

 ・Component of  Procedure 2 (Integration Object)

The "URL" is the Box API endpoint for obtaining an access token.