How do I change the default assignee when a ticket is created Edited

[jeff naughton]

How do I change the default assignee when a ticket is created through an email or when a ticket is created? The current assignee is disabled in Active Directory and no longer with the company and not listed in any groups within Jira.   I am not able to change the default assignee to another user or unassigned.    Thank you 

[Daniel Ebers]

Hi Jeff,

welcome to the Atlassian Community!

In which case the default assignee is set specifically and how does an issue look like in this case?

I am asking because there are several causes/places where a default assignee *could* set set:

Components:
https://confluence.atlassian.com/adminjiraserver/managing-components-938847187.html#Managingcomponents-default_assigneeSelectingaDefaultAssignee

Post-Function of a Workflow:
https://support.atlassian.com/jira-cloud-administration/docs/configure-advanced-issue-workflows/#Advancedworkflowconfiguration-postfunctions

Automation:
https://support.atlassian.com/jira-software-cloud/docs/automate-your-jira-cloud-processes-and-workflows/

Especially for Jira Service Management there are some more hidden options:
https://community.atlassian.com/t5/Jira-Service-Management/Where-change-set-Default-Assignee-JIRA-Service-Desk/qaq-p/942336

What me leaves me wondering is the fact the user is deactivated. Most of the logic should exclude the user from being considered further - but please double check the locations mentioned above.

Cheers,
Daniel