If the synchronisation did not happen as expected you can check the Sync history under your connector at Connectorly.
Once logged in select the Sync History tab.
If you see a message saying the Dynamics 365 solution hasn't been installed/missing you can troubleshoot the issue as follows.
Have you installed the Connectorly Managed Solution?
Navigate to Settings > Solutions in Dynamics 365. You should see just one, Managed, Connectorly for Dynamics 365 and Xero solution installed as highlighted below:
If you can't navigate to see this then you don't have permission to install solutions. You will need to speak to someone who has administrative access to your Microsoft Dynamics 365 instance for help.
If you can't see the solution installed, you will need to install the solution either through Microsoft AppSource or by downloading the manual package and installing that way.