The probes data_engine, sla_engine and udm_manager are in a red state and I am also unable to activate them.
Correct the data_engine configuration so it is pointing to the primary instance database instead of the secondary.
As per this MS SQL Forum this happens when the application is pointing to the secondary database instead of the primary database:
Job failed. The target database ('XXX') is in an availability group and is currently accessible for connections when the application intent is set to read only.
Other related information can be found here: