If you're publishing .app files: New certs need secure hardware (Azure Key Vault or FIPS USB).
❌ No valid signature = No AppSource Even on-prem needs explicit skip
Options:
✔️ Azure Key Vault
✔️ .PFX (legacy)
✔️ Self-signed (local/on-prem)
Full guide: 👉 Sign an app package file — Business Central | Microsoft Learn
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