Cannot get customField option, with 403 error

Question

I have a oauth 2.0 app and trying to get the allowedValues for the customFields.

1. I used the `rest/api/3/issue/createmeta` api to get the fields info. some of the fields has allowedValue and some are not. For all customFileds there is no allowedValues info.

2. Found this api `/rest/api/3/customFieldOption/{id}`. I suppose the  key like `customfield_10020` like the above screenshot should be the id for the customFieldOption. 
I enabled the required scope listed in here https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-custom-field-options/
But I still got 403 error. 
The access user is the Jira cloud creator, so I think it has  Administer Jira global permission &  Browse projects project permission.

danielphoenix · Answer

Figured out the issue for my use case. Including it here to help others in the future:

`/rest/api/latest/issue/createmeta/{projectIdOrKey}/issuetypes/{issueTypeId}`

^ specify the issue type as whatever your default is, in my case 10001 for story.

From the response, get the values and filter it by fieldID = {your custom field}.

then grab the allowedValues of that field.

$customField = response.values | Where-Object { $_.fieldId -eq "customfield_10020" }

$customFieldOptions = $customField.allowedValues