We have reported recently issue with Jira Teams multiplication - The issues was caused by the migration - https://jira.atlassian.com/browse/JRACLOUD-93358
After reporting it to Atlassian we've received following message:

Due to the fact that some of the Teams were not only duplicated but occurred 6-10 times, before we've noticed the issue, users were adding the Team's value to the tickets that caused the situation were Team A is added to around 4k tickets but from the Team ID perspective they are added to diferent teams cause Team A is replicated 8 times.
We cannot easily bulk edit the issues due to Automation Service Limits

We've tried using okta workflows and build the custom api action:
PUT
/rest/api/3/issue/{iisue.key}
with body:
{
"fields": {
"customfield_11100": "######-####-######-######-##"
}
}
but we are receiving error 400
"customfield_11100": "Field 'customfield_11100' cannot be set. It is not on the appropriate screen, or unknown."
Did anybody found the solution for this?