httpPlatformHandler HTTP Error 502.3 - Bad Gateway Error Code 0x8007053d

Question

I tried to run Python with Waitress in IIS.

web.config in the test folder is as follows.

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Error Code 0x8007053d does not change even if web.config is as follows.

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So I suspect the following areas may be responsible

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httpPlatformHandler is registered correctly in IIS Manager