Why can't the OTAA model always join the network?

Why can’t the OTAA model always join the network?
I have tried for a long time and found that OTAA has been unable to connect to the Internet. The data flow is as follows.

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This is at least the third time you brought this up. Why didn’t you respond to my attempt to help in your Why OTAA mode is always activation 17 days ago?

I’m closing this one.

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