The private key you’ve selected does not appear to be valid.

When I was set GCP APP engine setting for ssl certificate, "Add a new SSL certificate"
my own cert(got it from lets encrypt through certbot with debian os)
I got error:
The private key you've selected does not appear to be valid.

get openssl and copy your certificate pem file to the bin folder of openssl,

openssl for windows:

then ren openssl command line (replace “private.key” or “Privkey.pem” with your own

file name in the following command line, then you can file the privte_rsa.key file in the bin folder, then open it by text editor, copy and paste it to your Google cloud platform.

openssl rsa -in private.key -out private_rsa.key

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