Anytime frictional contact is used, you must insert a Contact Tool under the Connections folder and generate the initial contact status. Check that all the contacts are closed on the worksheet. Any that are not closed but have tiny gaps, like 1e-3 sized gaps, those can be closed by editing the contact and setting the interface treatment to Adjust to Touch.
The other thing to do with frictional contact is under Analysis Setting, turn on Auto Time Stepping and set the Initial Substeps to 100, Minimum to 1 and Maximum to 1000.
If you have problems after that, please do File, Archive to create a .wbpz file. That can be attached to your reply and state the version of Ansys you are using.
If you can't share the file, at least post an image of the lens barrel cross-section that you have created.