@Wonka88 Not sure if you figured it out yet, but have you added "tailscale0" into your Unraid network settings? From UnRaid:
Go to Settings > Network Settings
Scroll down to the "Interface Extra" section
Enter "tailscale0" (without the quotes) in the "Include listening interfaces:" field
Then do a hard refresh (CMD + Shift + R on a Mac or CTRL + F5 on Windows) on your browser