In latest version of Camunda Desktop Modeler (I believe from 5.15.0) I face the following issue.
The field Time to live in History Cleanup is red (Time to live must be defined.) when I am saving a diagram, even thought it is filled (P30D).
However I can deploy the diagram and it takes the correct time to live. Do you know why it shows as an error?
I saw a post here on the forum about this, and comments that this is a bug that will be resolved, but that you can normally use this field “disregarding” this error message.
If I find the post I saw this a while ago, I’ll send it here!
Do a test to see if this statement is actually true… try deploying your process, even if the error message is appearing and check if the TTL was implemented correctly.