RSA 2048b SSH key, put on the server (on the same ~/.ssh/authorized_keys file as the other *working* keys, so no permissions issue here) does not work?
use -v and share the results
Here it is: https://pastebin.com/5Uvq3cC7 Thank you
check the file permissions of the .ssh folder it should be 700 and the authorized_keys should have 600
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