unable to update custom fields within jira.
Hi @Robyn Woelffer Welcome to the Atlassian Community.
There is an active incident reported related to single select custom fields and you can find the status in https://status.atlassian.com/ and https://jira-software.status.atlassian.com/
You can find a workaround here- https://jira.atlassian.com/browse/JRACLOUD-81638
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