A nested query with quotes doesn't work
Problem
You use quotes in your query and you get a parsing error.
Let’s say that you query with a field that contains a space in its name - you need to use the quotes:
"Epic Link"=ABC-1
This query works fine but it fails if you use it as a nested query in a JQL function:
issue in linkedIssuesOfQuery(""Epic Link"=ABC-1")
Error in the JQL Query: Expecting ')' or ',' but got 'Epic'. (line 1, character 32)
Solution
Make sure to use single quotes inside the nested queries.
For example: issue in linkedIssuesOfQuery("'Epic Link'=ABC-1")