There is a service app log that should have error messages about SSL if the web ui is trying to use your SSL certs.
If the web ui is trying to use your certs but there is something wrong with them, then it shouldn’t actually work at all.
You may have the wrong name or wrong folder for the files. The SSL certs DO NOT go in the certs folder.
You may need to create a PMR with IBM to work with support to get this resolved. How to ask for IBM product help: PMRs, RFEs, and more