Why my Android phone cannot connect to IKEv2 remote access VPN with Pre-Shared key?

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Question:

Why my Android phone cannot connect to IKEv2 remote access VPN with Pre-Shared key?

Answer:

If you follow this FAQ IKEv2 VPN with Pre-Shared key on Mobile Devices (Instead of L2TP) — Zyxel Community but encounter connection failure, please check if your Pre-Shared key has big capital and change it to small capital. This issue is because the Android didn't support big capital in the Pre-Shared key column.