The answer
The sponsor or bundler can reject an operation due to policy limits, an invalid signature, an outdated nonce or insufficient gas configuration. Token balance alone does not ensure sponsorship.
What to do next
Check the chain ID, EntryPoint, signature, paymaster validity and bundler error before retrying.
ethereum.org — Wallet and account documentation
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Ledger hardware wallet
Relevant hardware-backed signing for supported assets; it does not eliminate gas fees, contract vulnerabilities or approval risks.
Explore Ledger hardware wallet ↗Official website; affiliate programme available to apply for. No tracked link or partner approval yet.