Summary

When changing the Acmebot:Contacts configuration value in Azure Function App settings, the ACME account contact information gets permanently nullified in account.json, causing subsequent certificate operations to fail with null reference errors.

Steps to Reproduce

• Deploy Acmebot with initial contact email (e.g., old-email@example.com)
• System works correctly for certificate operations
• Change Acmebot:Contacts configuration to new email (e.g., new-email@example.com)
• Restart Function App
• Attempt any certificate operation results in failure

Behavior

Contact information in account.json becomes null
All subsequent certificate operations fail with null reference errors
Manual editing of account.json to restore contact temporarily fixes the issue