Thanks @Rewati Rashmi for posting in community.
I can see from the error it states - connection refused and suggested to check access rights and repository rights.
Could you please check this documentation if it helps https://support.atlassian.com/bitbucket-cloud/docs/set-up-additional-ssh-keys/?
There might be multiple reasons, one of them might be ssh key not matching with remote repo.
Alternatively, Please check these articles and earlier community post for reference -
Please respond and accept the answer if it helps else allow others to share input.
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