THIS IS A TEST INSTANCE. Feel free to ask and answer questions, but take care to avoid triggering too many notifications.

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To decrypt the TLS traffic you need the (Pre)-Master-Secret.

For example using curl on Bash (Linux) prompt:
SSLKEYLOGFILE=$PWD/mykey.log curl -L http://...
And add this file to wireshark.

For more information see: https://gitlab.com/wireshark/wireshark/-/wikis/TLS#using-the-pre-master-secret

The private key can only be used on old/outdated ciphers.

PS: better a long post than one with not enough info :-).