Teamviewer 13 Not Working On Mac

I am going on a vacation soon and need to access my iMac for I have files stored on it. But here's where my problem starts. My Mac will have no problem connecting to my Windows laptop. It's only when the laptop tries to connect to the iMac it has a problem. I have been able to connect to the iMac only a twice: once from the laptop and once from my iPod; and then it refused all incoming connections. I don't know if this is a firewall issue or what. I doubt it is, though, because my firewall is off. Both the iMac and the laptop say 'awaiting authentication' but never gets past it. All help is appreciated.
P.S. I just posted it here because to me it seems like a hardware problem.

Feb 01, 2016 But if I have logged in my mac's user. Then, I can connect my mac via teamviewer. But if I am outside and my mac booted by schedule. Then, I cannot connect my mac via teamviewer. I tried reinstalling TeamViewer and it worked for about 2 days and then not working again. I also had another connection problem and wrote to Teamviewer. And macOS 10.15 (Catalina) has strengthened the security and privacy even further and requires additional permissions to be given to TeamViewer in order to control your Mac. Without this access, TeamViewer users connecting to macOS 10.14 or higher will only be able to view the screen but not control it with their mouse or keyboard.

iMac G4 Flat Panel, Mac OS X (10.4.11)

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