RDP Ubuntu RDP Connection Troubleshooting

I'm experiencing connection problems with my RDP setup on Ubuntu. Specifically, I am unable to connect as I keep getting an 'Authentication failed' error message when trying to connect.

Ideal Skills and Experience:
- Strong understanding and experience with Ubuntu
- Expertise in configuring and troubleshooting RDP on Ubuntu
- Experience with handling authentication issues
- Strong problem-solving skills and attention to detail