Windows 10 will occassionally have some issues where it can not connect to a file server, with only a general “unknown” error of 0x80004005. I found an excellent article at https://www.techjunkie.com/windows-cannot-access-computer-error-0x80004005/ which helped me with it. I'll summarize here. I'd recommend looking at his article as it is much clearer than I expect to do here.
After any/all of these, reboot the machine. It does not hurt to do all of these at once, then reboot.
His article has some additional steps, but these are the main ones I've used (SMB 1.0 solved a lot of my problems, and IPV6 is broke with Win10).