Rule not working

[Venkat Thota]

Hi,

I am using this https://community.atlassian.com/t5/Jira-Service-Management-articles/Populate-a-user-picker-field-from-the-description-field/ba-p/2134905 to change the reporter based on a text in the description of Jira. 

Description contains Reporter: my name

Then I tried to use that in the next step like this:

For Authorization, I have use base64 value of email:token as below

Authorization value is Basic base64valueofemail:token

I am getting 404. Can you help me what am doing wrong here?