I\'m working on a project in a private repository on https://www.bitbucket.com.
I\'m coding it locally, then staging, commiting and pushing the update via BitBucket\'s /
This is an old question, but every time there is a MacOS update, I came across this issue. Catalina was no exception.
First, you should check your config file to confirm if your old keys still there... it should:
~ ls -al ~/.ssh
Then you have to add again your key(s) by the name listed above:
~ ssh-add -K ~/.ssh/[key-name]