I'm far from the expert on such things, but it was not uncommon to see a mcct adjusted while the engine was running on various bikes when I was younger.
(before hydraulic cct became prevalent)
The procedure usually resulted in a backing out of the tensioner, slowly, until the essence of "clatter" could be witnessed.
Keep in mind that I'm talking about far less clatter than many Teneres have displayed at cold startup. So I'm not talking about a dangerous loosening at all.
Then, the tensioner was tightened until the clatter was gone.
I have also heard the OTHER sound that is made when adjusted to (too) the "tight" side of the equation, and I've described it as a whirring sound, caused by the excessive chain guide contact.
I've never seen any official documentation on how to adjust the Tenere with a mcct. Doubt I ever will since it was designed with the hydraulic version.
So me? I'll just treat mine the same old-school way I learned growing up.
Erring on the loose side of the equation.
Reserving the right to change my mind, of course, if\when one of the really smart fellas on this forum comes along and exposes my folly.
(not that rare.
)