APPROVER/ approver groups: unable to add user(s)

[Alyssa Hill]

Hi there, we need to add an 'approver' or  'approver groups' to our workflow.

I first tried the group, but was unable to add any users to the group. Next I tried to add 'approver' singular (custom field), ensuring the request types have the correct field included with no progress.

In the singular example,  when I try to add a default user I'm greeted with an error: 

As you can see, this user does exist:

Strange enough, when I navigate back to the workflow the original 'approver' field I had selected no longer appears when I click to edit the approval step: 

Now only the 'groups' options appears. What am I missing? Any help is greatly appreciated! 

[Alex Koxaras -Relational- · Accepted solution]

Duplicate here https://community.atlassian.com/t5/Jira-Service-Management/APPROVER-approver-groups-unable-to-add-user-s/qaq-p/2336629