The Yellow Triangle indicates that the device either cannot talk to the calendar connector, or the connector cannot get the calendaring data.
Verify you are on the most current connector version.
If you are using On-Prem Exchange Connectors and made a password change to the service account, you will need to update that password in the Connector configuration page
If you are using O365 Exchange Connectors and you have updated your Client Secret, you will need to update that Client Secret in the Connector configuration page.
If you are using rwcloudconnector.com or rwcloudconnector.steelcase.com connectors you will need to upload the security certificate from the site to the devices using RoomWizard Admin Console.