This behavior has been introduced since Elements Connect 8.0.2.
Symptoms
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After restoring an Elements Connect backup, OAuth-based or token-authenticated datasources are no longer working.
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Access tokens appear to be missing
Cause
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For security reasons, access tokens are no longer included in backup exports, keeping sensitive secrets out of backup files.
Resolution
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After restoring your configuration from a backup, re-authentication will be required in the relevant datasources (either re-run the OAuth flow or re-enter the token).
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Token re-authentication should be treated as a standard post-restore step.