Legacy Schema is no longer serviced. If you are making your
request using the Legacy Schema, you need to migrate your application to the
Unified Schema. Here are some resources that will help you with the
migration:
If you need any additional help with the migration, you can use
Developer
Support
If you are making the request correctly using unified schema and are
still getting this error, retry the call. If it persists, please file
a Bug Report.
Additional Resources
Knowledge Base - the KB has several articles on how to
implement call retry and retry best practices for certain calls
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