Hi @QuocLieu,
I already have that enabled, but turns out the problem was using the tagged template literals like so. Found a similar thread with exactly what I needed, https://community.developer.atlassian.com/t/forge-api-ignores-query-string/60600/2
const url = `/rest/agile/1.0/board/{boardId}/sprint?state=active,future`
const route = route`${url}`
I should have made it more clear in the example that the above was what I was doing instead. Thanks for your help anyways!