Error joining SPS to SPP "The session connection has a missing, invalid, or non-unique value " (4259763)

Step 1: Accessing SPP Swagger 
1. Open the SPP Swagger interface at: https://SPP_Primary_IPorHostname/service/core/swagger 
2. Click Authorize in the upper right corner. 
3. On the next dialog window, click the first Authorize button that appears. 
4. You will be redirected to the SPP login page. Authenticate using your Admin equivalent credentials.
5. Click Close button on the dialog window.

Step 2: Retrieving the Session module ID for Removal 
1. Navigate to Cluster -> GET /v4/cluster/SessionModules and click Try it out! then click Execute
2. Identify if the unwanted session connection exists on the list:
    a. If the unwanted session connection exists in the list, then:
        Note the ID of the session connection.
        Go to Step 3

    b. If the unwanted session connection does not exist in the list, then:
        Repeat the GET /v4/cluster/SessionModules and click Try it out!
        This time, set the includeDisconnected parameter to true.
        Click Execute
        Note the ID of this disconnected session connection.
        Go to Step 3

Step 3: Hard Delete the session module:
1. Use DELETE /v4/Cluster/SessionModules/{id} and click Try it out!
2. In the ID field, enter the value obtained from the previous GET request.
3. Click Execute. 
4. Click Execute a second time to perform the hard delete.
4. A 204 (No Content) response code indicates that the session module was deleted successfully

Step 4: Deletion Validation 
1. Go to GET /v4/Cluster/SessionModules request again and click Try it out! 
2. Click Execute
3. Verify the response body is blank
4. Repeat this step with the includeDisconnected parameter set to true then Click Execute,
5. If the ID was removed, it will no longer appear in the API response body. 

Step 5: Relink SPP to SPS
1. From the SPS web interface of the SPS Central Management node, go to Basic Settings > Cluster management 
2. Relink SPP to SPS and make sure to use either the IP address or hostname whichever one is included in the SPP SSL Certificate.
3. The process should now complete successfully