Next Cloud With KeeWeb

I installed the KeeWeb to get my passwords from KeePass But having a problem with it saying
Your browser doesn’t support some important features we’re using.
WebCrypto is not supported


I will do some guessing as you don’t provide any detailed information.

I guess you installed a 3rd party app inside your NextCloud instance?
I guess it is this one?
I guess you have the error message on your browser on your desktop computer or some other local mobile device?

probably better to report such an issue to the maintainer of this 3rd party app