Error when installing SRM 8.1

I am trying to install SRM 8.1 on a Windows 2016 Standard server but I keep getting the following error:

Error 25239: Failed to configure Site Recovery Manager Client.Details: Failed to acquire token from SSO Server at 'https://PSC_server/sts/STSService/vsphere.local'

Just for a little background on the environment, I have a vCenter server with external PSC. The environment is a vSphere 6.5 Built 8307201. The certificate on the PSC was replaced with one issued from our internal CA. The PSC is also configured as an intermediate CA.

SRM installation on the protected site went well without an issue. The protected site is using a different PSC.

Your assistance will be greatly appreciated.