Hi,
The error message "The action can only be done in a 
model having an email thread" suggests that the automation platform 
you're using expects the target model to support email threading 
functionality. To resolve this, consider the following steps:
1. Ensure the Target Model Supports Email Thread:
Check
 if the model you are working with has email threading capabilities. In 
some systems, certain models or objects are designed to handle email 
threads. If your current model doesn't support this, you may need to 
choose a different model or adapt your workflow accordingly.
2. Check Email Field Configuration:
Confirm
 that your model includes an email field or that you are correctly 
referencing an email field in your automation. The system may require an
 email field to be present in the model for the email threading 
functionality to work.
Hope it helps