How to fix app login issues? (Technical Support)

Troubleshooting Authentication Failures

1. Verify that the wallet address or email used during registration matches exactly what is stored in the system—case sensitivity and trailing spaces often cause silent mismatches.

2. Confirm the app version is up to date; legacy builds may lack support for newer JWT token signing algorithms or OAuth 2.1 endpoints.

3. Check if the device clock is synchronized with NTP servers; time skew exceeding five minutes invalidates short-lived access tokens issued by blockchain identity providers.

4. Inspect browser or mobile OS permissions—especially “Allow Notifications” and “Background App Refresh”—as some decentralized auth flows rely on push-based challenge-response handshakes.

Recovering from Wallet Signature Errors

1. When MetaMask or Phantom prompts “Signature rejected”, ensure the connected network matches the one expected by the dApp’s frontend configuration—mainnet vs testnet mismatches trigger immediate session aborts.

2. Clear cached signature nonces stored in IndexedDB; stale counters prevent replay protection mechanisms from validating fresh sign-in requests.

3. Disable hardware wallet bridges temporarily—if Ledger Live or Trezor Suite is running, its USB enumeration can interfere with WebUSB handshake sequences required for secure enclave authentication.

Analyzing Backend Identity Service Logs

1. Look for HTTP 401 responses containing “invalid_signature_format”—this indicates the frontend passed a malformed EIP-712 typed data structure to the signing provider.

2. Search for entries tagged with “nonce_mismatch” in the AuthZ microservice logs; this signals either client-side nonce reuse or backend Redis TTL misconfiguration.

3. Trace correlation IDs across wallet-connect, identity-verifier, and session-manager services to isolate where the JWT payload gets stripped of required claims like “sub”, “iss”, or “chain_id”.

Handling Cross-Chain Session Conflicts

1. If logging in via Polygon ID while holding an active Ethereum session, the session manager may reject the new context due to domain-scoped cookie restrictions—switching to subdomain-based auth cookies resolves this.

2. Multi-chain wallets like Trust Wallet sometimes inject conflicting window.ethereum providers; forcing explicit provider selection via window.ethereum.request({ method: 'wallet_switchEthereumChain' }) before auth initiation prevents race conditions.

3. Avoid mixing ERC-4337 account abstraction logins with EOAs in the same session store—their signature schemes (userOperation vs personal_sign) are incompatible at the session validation layer.

Frequently Asked Questions

Q: Why does the app show “Invalid credentials” even after entering correct seed phrase?A: Seed phrases are never transmitted to servers; this message usually means the derived wallet address failed verification against the on-chain identity contract—check if the deployed verifier contract matches the chain ID in the login request.

Q: Can I log in using a Ledger Nano X on iOS Safari?A: Yes, but only if WebUSB is disabled and the dApp uses WalletConnect v2 instead—iOS blocks direct USB access, so QR-based pairing becomes mandatory for hardware wallet integration.

Q: What causes “Session expired” immediately after successful signature?A: This occurs when the backend issues a session cookie with SameSite=Strict but the frontend initiates the auth flow from a third-party iframe—switching to SameSite=Lax or issuing stateless JWTs in HTTP headers avoids the issue.

Q: Why does biometric login fail on Android 13+ with “Keystore operation failed”?A: Android’s StrongBox Keymaster enforces stricter attestation requirements; the app must declare android:allowBackup='false' and use KeyGenParameterSpec.Builder.setIsStrongBoxBacked(true) during key generation.