The 422 Unprocessable entity indicates that the action could not be processed properly due to invalid data provided. This occurs when there is a data conflict. For example, if you are trying to create a new user and the user email already exists, the server will return a 422 Unprocessable entity.
Example of 422 Unprocessable entity
Solution
Verify that the input data provided is valid.
For a Create record action, check if there is already a record with a unique key (email, ID).
For an Update record action, check if the record exists. Otherwise, create a record.
Check that all reference IDs are valid. For example, when assigning a Salesforce lead to a sales rep, there must be an existing sales rep.
Check if the field is required. If so, the field cannot be blank.