As you're not able to sign in, could you please try the steps mentioned below and let us know if it helps?
1. Open System Preferences in Mac OS.
2. Select Sharing.
3. Enter your computer name into the Computer Name field. The computer name you need to enter into this field is in the text directly under this field, and contains a .local suffix. The computer name you need to enter is this name, but without the .local.
Note: If the computer name in the text is just .local, enter whatever computer name you wish into the Computer Name field, but do not include the .local.
4. Close System Preferences.
I think that worked! It's working now and hopefully will continue to do so. The names were off by just a few characters. Thank you!
Glad we got it working Megan! please feel free to reach out to us for any future queries!
My original problem is back. It just stopped connecting and I get the same message as before. Is there any further advice?