GroupShare 2017 ChangeAssignment API throws BadGatway error

Hi

I'm attempting to change the translator for about 300 files in the same project and language. The ChangeAssignment call returns with a BadGateway error, but I can see in Studio that the changes were actually applied. I assume that this is some kind of timeout, but where (IIS)? Can this be increased?

The call works perfectly with a smaller set of file, e.g. 10.

I've tried 2 different client approaches, GroupShareKit and RestSharp. Both produce the same results.

 

Splitting the assignment into multiple calls does workaround the problem. I cannot use this approach though, as the translator will receive multiple emails.

 

Any ideas (other than improving the hardware)?

 

Thanks

Alan