Hi I tried using shared mailbox,
It works for me. Try putting a try catch expression and catch the exception using log message … you will get better error handling and will tell you which folder its not found instead of just getting null value error.
Worst case worst try creating a project from scratch in new workflow… It might work.
Here are my results
I created a new project from scratch and tried everything still the same error with version 2.7.22 and 2.7.23. The stack trace of the error gives the same message that “xxx” folder is not found, but the folder is present.
However, a new version of Microsoft Office365 is released i.e. v2.7.24 and it fixed the issue for us. It performs the different email operations.