When you create a Catchr source for Amazon DSP, please note that Amazon imposes a restriction:
You can only list up to 50 Amazon DSP accounts per Amazon manager account.
If you need to connect more than 50 DSP accounts, you must:
Create an additional Amazon manager account.
Assign the extra DSP accounts you want to track to this new manager account.
In Catchr, either:
Refresh the authorization of your existing Amazon DSP source, or
Create a new Amazon DSP source.
Catchr will then automatically list all the Amazon DSP accounts available under each connected manager account.