Custom server issue in Salesforce Activity package

The custom server option in Salesforce activity package is not working,
Even after mentioning custom server address the activity is trying to connect to (refer the sreenshots).

Clueless where it went wrong.

Can you try avoiding the complete username only include the text before @. Avoid Domain details

Hello @yogesh_G ,

Have you gone through the below document for the configuration?

@Rahul_Unnikrishnan yeah, configured as described above

@Lak_Ui this didnt work

oh ok…What is happening if you select the server as Test

yes, it didnt work because I want to connect with my customized salesforce not