How to find Tenant name and ID in LCS dynamics
There are two ways to find Tenant name and ID
Solution 1 (Dynamics D365 F&O)
Logon to MS Dynamics

Hit question mark (?) and select About

Select Licenses and here you can find Tenant name and Id.
Solution 2 (LCS dynamics)
Logon to LCS dynamics project with a LCS Administrator rights

1. LCS dynamics Lifecycle Service Home Page
2. Enter User License Consumption

Here you can find Tenant name and Id.