Cannot Push/Pull after upgrading to Mac OS High Sierra

[Mike Manusama]

I was able to push/pull fine until I upgraded my OS to High SIerra. Now that I have done that I am getting the following error:

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree fetch origin

git@bitbucket.org: Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

git@bitbucket.org: Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

git@bitbucket.org: Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

git@bitbucket.org: Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

Completed with errors, see above

The SSH Key is the same on both Bitbucket and my Sourcetree, and I have used 2 factor authentication on Bitbucket. I am still seeing this error though and cannot commit. Has anybody had these issues since upgrading to High Sierra? FYI I am on Sourcetree 2.7.6

[Manju]

Please check if the ssh-agent has your keys loaded. If not, please add them to the agent. 

Run below commands in terminal to do so,

To check if keys are loaded:

ssh-add -l

To add keys to agent:

ssh-add <path_to_key>

more like,

ssh-add ~/.ssh/id_rsa

Key in the passphrase used while generating the ssh key and you should be good to go.