I think it's not possible to change the defaults. You can only edit permissions after a plan has been created.
A workaround for this would be to create an empty plan, configure it's permissions, and instead of creating new plans just clone the existing plan - it's permissions will be preserved.
On 31 May, a GDPR-related change went live in the Bitbucket Cloud API that resulted in users not being able to create or edit Bitbucket Cloud Linked repositories in Bamboo. This API update removed t...
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