Unable to Access Windows server remotely

Hello, we are hosting a VM on a local computer using Hyper-V. we normally access the VM and work on it using windows remote desktop. This morning, we are tried connecting to the VM and it is not recognizing any of our passwords. I have logged on to the VM through the Host computer, restarted the VM, checked to see that the remote desktop services is running and they are. but yet I can't seem to resolve the issue. What could be the reason or what can I check to resolve this issue.