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we are using the STMicroelectronics/STNFCSensor tag, the tag configuration is Block Size: 4 Memory size in blocks: 2048 memory size in bytes: 8192 tag type: iso15693 Below i added my code func readSingleBlock(to tag: NFCTag, blockNumber: Int, completion: @escaping (Data) -> Void) { bfprint("NFC_Tag enter extendedReadSingleBlock blockNumber: \(blockNumber)") if case let .iso15693(tagIso15693) = tag { tagIso15693.extendedReadSingleBlock(requestFlags: [.highDataRate], blockNumber: blockNumber) { result in bfprint("NFC_Tag extendedReadSingleBlock \(result)") switch result { case .success(let data): self.retryAttempt = 0 bfprint("NFC_Tag Success tag response:", "\(data), ") completion(data) case .failure(let error): if self.retryAttempt > 5 { bfprint("NFC_Tag failure: \(error) \(error.localizedDescription) ") self.session?.invalidate(errorMessage: error.localizedDescription) } else { self.retryAttempt += 1 bfprint("NFC_Tag failure retryAttempt: \(self.retryAttempt) ") self.retryConnection() } } } } } func retryConnection() { guard let session, let tag = self.tag else { return } session.connect(to: tag) { [weak self] (error) in if let error = error { print("Retry connection error: \(error.localizedDescription)") self?.session?.invalidate(errorMessage: "Retry connection error: \(error.localizedDescription)") return } self?.readNfcTag(tag: tag) } } extendedReadSingleBlock function giving error "NFCError Code=100 “Tag connection lost”