Joining two fields does not return any matching values in ArcGIS Pro

Description

In ArcGIS Pro, when attempting to join two common fields from different tables using the Add Join tool, no matching values are returned in the joined table.

Cause

The data types of the common fields do not match.

Solution or Workaround

The data types of the common fields must be the same to join a layer to another layer or table in ArcGIS Pro. For example, a float field cannot be joined with a double field as the data types of the fields are different. Refer to ArcGIS Pro: Join the attributes from a table for more information.

To resolve this issue, change one of the field data types to the same data type as the other common field by creating a new field in the layer’s attribute table, and use the Calculate Field tool to populate the values of the new field. Refer to How To: Change the data type of an existing field in ArcGIS Pro for instructions.

The image below shows matching values are returned in the joined table when joining two common fields with the same data type in ArcGIS Pro.