Trouble adding ESXi Host to VCenter - Datastore conflicts with an existing datastore in the datacenter that has the same URL...

[cbcampbell]

I have a standalone ESXi Host running 6.5 that I'm trying to add to a VCSA (also 6.5).  When I try to add this host, I'm seeing this failure message:

I have scanned all datastores in vcenter visually and with PowerCLI, and do not see it already existing anywhere. 

[diegodco31 · Accepted solution]

Check if the following VMware KB article helps:

VMware Knowledge Base