Access code updates are not working for natively scheduled codes with `is_external_modification_allowed` set to `true`

[Andrewjeska]

Codes that are both natively scheduled (for example, schlage does this by default) and have is_external_modification_allowed = true will fail to update via the Seam API when the starts_at or ends_at date is changed.

Until we've resolved the underlying issue, we recommend the following workaround:

For codes that are "stuck" after an update, we recommend setting is_external_modification_allowed = false on that code.