See:

• https://support.mozilla.org/en-US/kb/extensions-button

Extensions need permission to run in private windows when the browser is in private browsing mode.

I've allowed it every time and it still does not work. So, I tried it without checking that box...that doesn't work either. I went back to checking that box and NOTHING! You may be having a problem with Windows 11 or it's the same old story with you and Last Pass. Issues galore.

Does it still happen in a new profile (without signing into sync account)? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

If Firefox does not communicate with Last Pass, and it DOES NOT, on one of its own extensions, then I don't know what Mozilla has come down to. I finally received a call from a Last Pass technician and he solved the problem for me. How to obtain the shortcut for the desktop was the only question I had and not one of you could help this faithful and loyal Firefox user to get it done. While I appreciate any help and assistance from you, perhaps a pertinent question might have been asked in order to comprehend what I needed and wanted.