ssh-forgot-my-identities.sh

# you can check that with ssh-add
ssh-add -l
# response when these steps need to be taken: 'The agent has no identities.'
# response when everything ok would be more like:  '2048 SHA256:yourkey /Users/youryousername/.ssh/id_rsa (RSA)'

# start the ssh-agent
ssh-agent -s

# add your keys. 
ssh-add ~/.ssh/id_rsa
# ssh-add will ask for your pasphrase. Enter it.

# now check whether it worked:
ssh-add -l
# output should look a bit like '2048 SHA256:yourkey /Users/youryousername/.ssh/id_rsa (RSA)''