Error: Invalid data or no response: The receiving plugin may not be activated

I've done searches on here and on Google and have followed all the instructions but I'm still getting issues. The error with the WHMCS Provisioning plugin is:

"Error: Invalid data or no response: The receiving plugin may not be activated"

All systems are up to date, I've tried everything. There seems to be several other errors people have with the same issue but nothing at this point has helped discover what this issue could be.