One node in cluster not starting where other two nodes are running fine

Hi Team,

We are working on a cluster setup . Earlier we were using 5.0.24 version and upgraded to 7.0.7.
We were able to start but when i enabled auth on like as shown below

security:
authorization: enabled
keyFile: /var/log/mongo/keyfile

one server mongo process throwing error for keyfile where as other 2 node are fine and able to start cluster with 2 nodes now.

If someone faced similar issue and can help out for same would be great. TIA

Show us the exact error
Is keyfile having correct permissions
Is it in the correct path
Show us the config file of that node
Have you copied the same keyfile to all the nodes?